Fixes #3350.

R=golang-dev, adg, r, fullung
CC=golang-dev
https://golang.org/cl/6445092

R=golang-dev, dave
CC=golang-dev, minux.ma
https://golang.org/cl/6461065

The keyword reprents an untyped nil and is useful for
passing nil values to methods and functions. The
nil will be promoted to the appropriate type when
used; if a type cannot be assigned, an error results.

R=rsc, dsymonds
CC=golang-dev
https://golang.org/cl/6459056

Although I don't use PAX enabled ARM kernels, PAX
does have support for ARM, so we're better off add
PT_PAX_FLAGS now in case people use PAX kernels.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6453092

Pass 1 additional test.

R=nigeltao
CC=golang-dev
https://golang.org/cl/6454124

Pass 1 additional test.

R=nigeltao
CC=golang-dev
https://golang.org/cl/6459060

R=rsc, minux.ma, golang-dev, nigeltao
CC=golang-dev
https://golang.org/cl/6461047

(I also updated the wiki's GoTalks page with all the latest videos.)

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6441113

Surrogate halves are part of UTF-16 and should never appear in UTF-8.
(The rune that two combined halves represent in UTF-16 should
be encoded directly.)

Encoding: encode as RuneError.
Decoding: convert to RuneError, consume one byte.

This requires changing:
        package unicode/utf8
        runtime for range over string
Also added utf8.ValidRune and fixed bug in utf.RuneLen.

Fixes #3927.

R=golang-dev, rsc, bsiegert
CC=golang-dev
https://golang.org/cl/6458099

R=r
CC=golang-dev
https://golang.org/cl/6458097

Also rename the testing CGI argument from "email" to "user".

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6454117

R=adg, remyoudompheng, rsc, r
CC=golang-dev
https://golang.org/cl/6457085

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/6443091

Some browsers (e.g. IE9) ignore the case of 'id' attributes
which can lead to conflicts. Prefix non-generated 'id's with
"pkg-" to make them different from any generated attribute.

Also: Added missing entry for "Other packages" to top-level
index.

Fixes #3851.

R=adg, dsymonds
CC=golang-dev
https://golang.org/cl/6449105

If a table contained whitespace, text nodes would not get foster parented
correctly.

Pass 1 additional test.

R=nigeltao
CC=golang-dev
https://golang.org/cl/6459054

Section B.2.3 of http://www.w3.org/Graphics/JPEG/itu-t81.pdf discusses
the End of spectral selection (Se) byte.

Apparently many JPEG decoders ignore the Se byte (or let it through
with a warning), but some configurations reject them. For example,
http://download.blender.org/source/chest/blender_2.03_tree/jpeg/jcmaster.c
has these lines:

if (Ss != 0 || Se != DCTSIZE2-1 || Ah != 0 || Al != 0)
  ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);

Fixes #3916.

R=r
CC=golang-dev
https://golang.org/cl/6459052

Depends on CL 6197045.

Result obtained on Core i7 620M, Darwin/amd64:
benchmark                       old ns/op    new ns/op    delta
BenchmarkComplex128DivNormal           57           28  -50.78%
BenchmarkComplex128DivNisNaN           49           15  -68.90%
BenchmarkComplex128DivDisNaN           49           15  -67.88%
BenchmarkComplex128DivNisInf           40           12  -68.50%
BenchmarkComplex128DivDisInf           33           13  -61.06%

Result obtained on Core i7 620M, Darwin/386:
benchmark                       old ns/op    new ns/op    delta
BenchmarkComplex128DivNormal           89           50  -44.05%
BenchmarkComplex128DivNisNaN          307          802  +161.24%
BenchmarkComplex128DivDisNaN          309          788  +155.02%
BenchmarkComplex128DivNisInf          278          237  -14.75%
BenchmarkComplex128DivDisInf           46           22  -52.46%

Result obtained on 700MHz OMAP4460, Linux/ARM:
benchmark                       old ns/op    new ns/op    delta
BenchmarkComplex128DivNormal         1557          465  -70.13%
BenchmarkComplex128DivNisNaN         1443          220  -84.75%
BenchmarkComplex128DivDisNaN         1481          218  -85.28%
BenchmarkComplex128DivNisInf          952          216  -77.31%
BenchmarkComplex128DivDisInf          861          231  -73.17%

The 386 version has a performance regression, but as we have
decided to use SSE2 instead of x87 FPU for 386 too (issue 3912),
I won't address this issue.

R=dsymonds, mchaten, iant, dave, mtj, rsc, r
CC=golang-dev
https://golang.org/cl/6024045

Fixes #3711

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/6445083

R=r
CC=adg, gobot, golang-dev
https://golang.org/cl/6449096

The <title> element was getting removed from the stack of open elements,
when its parent, the <head> element should have been removed instead.

Pass 2 additional tests.

R=nigeltao
CC=golang-dev
https://golang.org/cl/6449101

This is an attempt to fix windows build. Will restore
once we know what the problem is.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/6461046

R=adg
CC=golang-dev
https://golang.org/cl/6458043

   Part of issue 3747.

R=dave, lvd, rsc
CC=golang-dev
https://golang.org/cl/6084044

        Fixes #3748.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6357064

        our old choice is not working properly at least on VFPv2 in
ARM1136JF-S (it's not preserved across float64->float32 conversions).

        Fixes #3745.

R=dave, rsc
CC=golang-dev
https://golang.org/cl/6344078

        Introduced in CL 6452046.

R=golang-dev, nigeltao, dave
CC=golang-dev
https://golang.org/cl/6459051

   Enhances test/run.go to support testing other directories
   Will enable stdio tests on Windows in a follow-up CL.

R=golang-dev, alex.brainman, rsc
CC=golang-dev
https://golang.org/cl/6220049

When an element (like <nobr> or <p>) was implicitly closed by another
start tag, it would keep foster parenting from working because
the check for what was on top of the stack of open elements was
in the wrong place.

Move the check to addChild.

Pass 2 additional tests.

R=nigeltao
CC=golang-dev
https://golang.org/cl/6460045

R=golang-dev, fullung
CC=golang-dev
https://golang.org/cl/6443085

R=golang-dev, rsc
CC=golang-dev, r, yarikos
https://golang.org/cl/6454104

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6454091

Hold ForkLock during dup of fd + cloexec in the net pkg,
per the locking policy documented in syscall/exec_unix.go.

R=golang-dev, dsymonds, adg
CC=golang-dev
https://golang.org/cl/6457080

Since NUL usually terminates strings in underlying syscalls, allowing
it when converting string arguments is a security risk, especially
when dealing with filenames. For example, a program might reason that
filename like "/root/..\x00/" is a subdirectory or "/root/" and allow
access to it, while underlying syscall will treat "\x00" as an end of
that string and the actual filename will be "/root/..", which might
be unexpected. Returning EINVAL when string arguments have NUL in
them makes sure this attack vector is unusable.

R=golang-dev, r, bradfitz, fullung, rsc, minux.ma
CC=golang-dev
https://golang.org/cl/6458050

R=golang-dev
CC=golang-dev
https://golang.org/cl/6454100

benchmark                                old ns/op    new ns/op    delta
BenchmarkCompareStringEqual                     51           35  -30.20%
BenchmarkCompareStringIdentical                 51            7  -85.71%
BenchmarkCompareStringSameLength                25           18  -28.29%
BenchmarkCompareStringDifferentLength            2            2   +1.46%

R=golang-dev, rsc
CC=golang-dev, remy
https://golang.org/cl/6450092

This line helps me to tell whether the CL is waiting for me or I'm waiting for the author.

Also:
 - vertical-align table cells so buttons are always aligned with CL headers.
 - add email= to show front page for someone else.

 Demo at http://rsc.gocodereview.appspot.com/.
 Until this is deployed for real, some recently changed CLs may be
 missing the 'first line of last message' part.

R=dsymonds
CC=golang-dev
https://golang.org/cl/6446065

Too many people use it without reading what it does.
Those people want ReadBytes or ReadString.

Fixes #3906.

R=golang-dev, iant, r
CC=golang-dev
https://golang.org/cl/6442087

The improvement is obtained by eliminating the zero
initialization of a large structure that is only
needed when the fast path fails.

Also add a missing roundtrip test for float32s.

benchmark                              old ns/op    new ns/op    delta
BenchmarkAppendFloatDecimal                  301          180  -40.20%
BenchmarkAppendFloat                         486          388  -20.16%
BenchmarkAppendFloatExp                      492          383  -22.15%
BenchmarkAppendFloatNegExp                   478          370  -22.59%
BenchmarkAppendFloatBig                      650          541  -16.77%
BenchmarkAppendFloat32Integer                308          180  -41.56%
BenchmarkAppendFloat32ExactFraction          449          333  -25.84%
BenchmarkAppendFloat32Point                  494          390  -21.05%
BenchmarkAppendFloat32Exp                    488          387  -20.70%
BenchmarkAppendFloat32NegExp                 488          378  -22.54%

R=r, rsc
CC=golang-dev, remy
https://golang.org/cl/6346081

The content of an HTML <title> element is RCDATA, but the content of an SVG
<title> element is parsed as tags. Now the parser doesn't go into RCDATA
mode in foreign content.

Pass 4 additional tests.

R=nigeltao
CC=golang-dev
https://golang.org/cl/6448111

I have C functions implemented in .syso file (rather than .so or inlined in .go file).
W/o this change the gcc invocation fails with undefined symbols.

R=minux.ma, rsc
CC=golang-dev
https://golang.org/cl/6352076