http.Client calls URL.String() to fill in the Referer header, which may
contain authentication info. This patch removes authentication info from
the Referer header without introducing any API changes.

A new test for net/http is also provided.

This is the polished version of Alberto García Hierro's
https://golang.org/cl/9766046/

It should handle https Referer right.

Fixes #8417

LGTM=bradfitz
R=golang-codereviews, gobot, bradfitz, mikioh.mikioh
CC=golang-codereviews
https://golang.org/cl/151430043

Debugging the builders and need a commit to make them run.

R=adg
CC=golang-codereviews
https://golang.org/cl/149600043

http://build.golang.org/log/c7a91b6eac8f8daa2bd17801be273e58403a15f2

# cmd/pprof
/linux-386-clang-9115aad1dc4a/go/pkg/linux_386/net.a(_all.o): sym#16: ignoring .Linfo_string0 in section 16 (type 0)
/linux-386-clang-9115aad1dc4a/go/pkg/linux_386/net.a(_all.o): sym#17: ignoring .Linfo_string1 in section 16 (type 0)
/linux-386-clang-9115aad1dc4a/go/pkg/linux_386/net.a(_all.o): sym#18: ignoring .Linfo_string2 in section 16 (type 0)
/linux-386-clang-9115aad1dc4a/go/pkg/linux_386/net.a(_all.o): sym#20: ignoring .Linfo_string0 in section 16 (type 0)
/linux-386-clang-9115aad1dc4a/go/pkg/linux_386/net.a(_all.o): sym#21: ignoring .Linfo_string1 in section 16 (type 0)
...

I don't know what these are. Let's ignore them and see if we get any further.

TBR=iant
CC=golang-codereviews
https://golang.org/cl/155030043

Fixes #8090.

LGTM=alex.brainman
R=alex.brainman
CC=golang-codereviews
https://golang.org/cl/154020043

Noticed while reviewing https://golang.org/cl/147690043/

I'd never seen anybody use IndexRune before, and
unsurprisingly it doesn't use the other fast paths in the
strings/bytes packages. IndexByte uses assembly.

Also, less code this way.

LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/147700043

Forgotten in https://golang.org/cl/147690043/

Update #8838

LGTM=r
R=r
CC=golang-codereviews, rsc
https://golang.org/cl/152220045

CC=golang-codereviews
https://golang.org/cl/151490043

A file name must have a non-empty underscore-separated
prefix before its suffix matches GOOS. This is what the
documentation already said but is not what the code did.

Fixes #8838.

This needs to be called out in the release notes.
The he single affected file
        code.google.com/p/go.text/collate/tools/colcmp/darwin.go
could use a renaming but works because it has a build tag inside.

LGTM=adg, rsc
R=golang-codereviews, adg, rsc
CC=golang-codereviews
https://golang.org/cl/147690043

Fixes #6764.
Fixes #8435.

LGTM=rsc
R=golang-codereviews, r, gobot, rsc
CC=golang-codereviews
https://golang.org/cl/116440046

The internal comments are not completely precise about
what is going on, and they are causing confusion.

Fixes #8283.

LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/151460043

While we're here, fix the implementation of Release on both
Unix and Windows: Release is supposed to make Signal an error.

While we're here, make sure we never Signal pid 0.
(Don't try this at home.)

Fixes #7658.

LGTM=r
R=golang-codereviews, r
CC=golang-codereviews, iant
https://golang.org/cl/152240043

Fixes #8742.

LGTM=bradfitz
R=golang-codereviews
CC=adg, bradfitz, golang-codereviews, iant
https://golang.org/cl/155910043

Fixes #8386.

LGTM=r
R=golang-codereviews, r
CC=golang-codereviews, iant
https://golang.org/cl/149570043

Generated using re2/doc/mksyntaxgo.

Fixes #8505.

LGTM=iant
R=r, iant
CC=golang-codereviews
https://golang.org/cl/155890043

For example, fixes 'go vet syscall', which has source
files in package syscall_test.

Fixes #8511.

LGTM=r
R=golang-codereviews, r
CC=golang-codereviews, iant
https://golang.org/cl/152220044

At last minute before 1.3 we relaxed SetFinalizer to avoid
crashes when you pass the result of a global alloc to it.
This avoids the crash but makes SetFinalizer a bit too relaxed.

Document that the finalizer of a global allocation may not run.

Tighten the SetFinalizer check to ignore a global allocation but
not ignore everything else.

Fixes #7656.

LGTM=r, iant
R=golang-codereviews, iant, r
CC=dvyukov, golang-codereviews, khr, rlh
https://golang.org/cl/145930043

Fixes #8382.

LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/149540045

Generated by a+c.

R=gobot
CC=golang-codereviews
https://golang.org/cl/151450043

This test is flaky, just like TestDualStackTCPListener.
That one was disabled. Disable this one too.

Update #5001

LGTM=bradfitz
R=rlh, bradfitz
CC=golang-codereviews
https://golang.org/cl/154950043

This approach was suggested in
https://golang.org/cl/138250043/#msg15.
Unlike current version of mksyscall_windows.go,
new code could be used in go.sys and other external
repos without help from asm.

LGTM=iant
R=golang-codereviews, iant, r
CC=golang-codereviews
https://golang.org/cl/143160046

R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/149370043

CC=golang-codereviews
https://golang.org/cl/152160043

It was inconsistent.
Also test these better.
Also document the default format for types.
This wasn't written down.

Fixes #8470.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/154870043

Update #8750

CC=golang-codereviews
https://golang.org/cl/153950044

Fixes #8349.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/147320043

The test doesn't work with GOTRACEBACK != 2.
Diagnose that failure mode.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews, r
https://golang.org/cl/152970043

Apply a similar transformation to %+v that we did to %#v, making it
a top-level setting separate from the + flag itself. This fixes the
appearance of flags in Formatters and cleans up the code too,
probably making it a little faster.

Fixes #8835.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/154820043

Removes another dangling pointer that might
cause a memory leak in 1.4 or crash the GC in 1.5.

LGTM=rlh
R=golang-codereviews
CC=golang-codereviews, iant, khr, r, rlh
https://golang.org/cl/150520043

This change was necessary on the dev.garbage branch
to keep the garbage collector from seeing pointers into
invalid heap areas.

On this default (Go 1.4) branch, the change removes
some possibility for memory leaks.

LGTM=khr
R=golang-codereviews, khr
CC=golang-codereviews, iant, r, rlh
https://golang.org/cl/155760043

Structs without tags have no unique name to use in the
Go definitions generated from the C types.
This caused issue 8812, fixed by CL 149260043.
Avoid future problems by requiring struct tags.

Update runtime as needed.
(There is no other C code in the tree.)

LGTM=bradfitz, iant
R=golang-codereviews, bradfitz, dave, iant
CC=golang-codereviews, khr, r
https://golang.org/cl/150360043

I will use different approach to solve this problem.
See CL 143160046 for details.

««« original CL description
syscall: keep Windows syscall pointers live too

Like https://golang.org/cl/139360044

LGTM=rsc, alex.brainman
R=alex.brainman, rsc
CC=golang-codereviews
https://golang.org/cl/138250043
»»»

LGTM=r
R=golang-codereviews, bradfitz, r
CC=golang-codereviews
https://golang.org/cl/147440043

The %#v verb is special: it says all values below need to print as %#v.
However, for some situations the # flag has other meanings and this
causes some issues, particularly in how Formatters work. Since %#v
dominates all formatting, translate it into actual state of the formatter
and decouple it from the # flag itself within the calculations (although
it must be restored when methods are doing the work.)
The result is cleaner code and correct handling of # for Formatters.
TODO: Apply the same thinking to the + flag in a followup CL.

Also, the wasString return value in handleMethods is always false,
so eliminate it.

Update #8835

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/146650043

The documentation states that Exp(x, y, m)
computes x**y mod |m| for m != nil && m > 0.
In math.big, Mod is the Euclidean modulus,
which is always >= 0.

Fixes #8822.

LGTM=agl, r, rsc
R=agl, r, rsc
CC=golang-codereviews
https://golang.org/cl/145650043

In the process, simplified internal sizeOf and
dataSize functions. Minor positive impact on
performance. Added test case.

benchmark                         old ns/op     new ns/op     delta
BenchmarkReadSlice1000Int32s      14006         14122         +0.83%
BenchmarkReadStruct               2508          2447          -2.43%
BenchmarkReadInts                 921           928           +0.76%
BenchmarkWriteInts                2086          2081          -0.24%
BenchmarkWriteSlice1000Int32s     13440         13497         +0.42%
BenchmarkPutUvarint32             28.5          26.3          -7.72%
BenchmarkPutUvarint64             81.3          76.7          -5.66%

benchmark                         old MB/s     new MB/s     speedup
BenchmarkReadSlice1000Int32s      285.58       283.24       0.99x
BenchmarkReadStruct               27.90        28.60        1.03x
BenchmarkReadInts                 32.57        32.31        0.99x
BenchmarkWriteInts                14.38        14.41        1.00x
BenchmarkWriteSlice1000Int32s     297.60       296.36       1.00x
BenchmarkPutUvarint32             140.55       151.92       1.08x
BenchmarkPutUvarint64             98.36        104.33       1.06x

Fixes #6818.

LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/149290045

Fixes #8447.

LGTM=iant
R=golang-codereviews, bradfitz, iant
CC=golang-codereviews
https://golang.org/cl/126190043

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/152010043

envi needs to be updated during Setenv so the key can be correctly deleted later with Unsetenv.

Update #8849.

LGTM=0intro
R=bradfitz, 0intro
CC=golang-codereviews
https://golang.org/cl/149300046

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/153830044

Fixes #8776.

LGTM=bradfitz
R=rsc, bradfitz
CC=golang-codereviews
https://golang.org/cl/145710043

Fixes #8305.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/145680044