Mild adaptation of rsc's 8021043, which I was unable to clpatch.
(rsc is offline)

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7741049

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7725049

Prevents storm of error messages if something goes wrong.
In the case of issue 5073 the epoll fd was closed by the test.
Update #5073.

R=golang-dev, r, rsc
CC=golang-dev
https://golang.org/cl/7966043

This CL avoids test data sharing in repetitive test runs;
e.g., go test net -cpu=1,1,1

R=golang-dev, fullung, bradfitz
CC=golang-dev
https://golang.org/cl/8011043

Handle interface comparison correctly,
add a few more tests, mark more nodes as impossible.

R=dvyukov, golang-dev
CC=golang-dev
https://golang.org/cl/7942045

Fixes #5119.

R=golang-dev, dvyukov, dave, rsc
CC=golang-dev
https://golang.org/cl/7838050

R=dsymonds
CC=golang-dev
https://golang.org/cl/7757043

Fixes issue with go test -cpu=1,1

R=minux.ma, bradfitz, nigeltao
CC=golang-dev
https://golang.org/cl/7808045

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/7475048

Make the copy directly in the convert switch instead of an extra loop.
Also stops converting nil-[]byte to zero-[]byte when assigning to *interface

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7962044

R=golang-dev, adg, bradfitz
CC=golang-dev
https://golang.org/cl/7696045

Fixes #5127

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/8011044

Fixes #5046

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/8016044

At some point in the past, I believe the GCD algorithm was setting d to
be negative. The RSA code has been correcting that ever since but, now,
it appears to have changed and the correction isn't needed.

Having d be too large is harmless, it's just a little odd and I
happened to notice.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7948044

Fixes SWIG callbacks.  Previously crosscall2 was only
cgo_export_static, despite the use of two #pragma declarations
in runtime/cgo/callbacks.c.

R=golang-dev, bradfitz, rsc
CC=golang-dev
https://golang.org/cl/7817048

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/7812050

This keeps the logic about how to set the thread-local variables
m and g in code compiled and linked by the gc toolchain,
an important property for upcoming cgo changes.

It's also just a nice cleanup: one less place to update when
these details change.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/7560048

This functionality moved into cmd/dist for Go 1.0.
Changes to this script have no effect.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/8020043

The right operand of a && and || is only executed conditionnally,
so the instrumentation must be more careful. In particular
it should not turn nodes assumed to be cheap after walk into
expensive ones.

Update #4228

R=dvyukov, golang-dev
CC=golang-dev
https://golang.org/cl/7986043

The ARM implementation of runtime.cgocallback_gofunc diverged
from the calling convention by leaving a word of garbage at
the top of the stack and storing the return PC above the
locals.  This change stores the return PC at the top of the
stack and removes the save area above the locals.

Update #5124
This CL fixes first part of the ARM issues and added the unwind test.

R=golang-dev, bradfitz, minux.ma, cshapiro, rsc
CC=golang-dev
https://golang.org/cl/7728045

Fixes #5105.

R=golang-dev, dave, daniel.morsing, rsc
CC=golang-dev
https://golang.org/cl/7965043

The edit makes Hypot's description match the form
used in the other routines in this package.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/8003046

Adds the new debugging constant 'checkgc'. If its value is non-zero
all calls to mallocgc() from hashmap.c will start a garbage collection.

Fixes #5074.

R=golang-dev, khr
CC=golang-dev, rsc
https://golang.org/cl/7663051

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/7725048

Fixes performance of the current windows network poller
with the new scheduler.
Gives runtime a hint when GetQueuedCompletionStatus() will block.
Fixes #5068.

benchmark                    old ns/op    new ns/op    delta
BenchmarkTCP4Persistent        4004000        33906  -99.15%
BenchmarkTCP4Persistent-2        21790        17513  -19.63%
BenchmarkTCP4Persistent-4        44760        34270  -23.44%
BenchmarkTCP4Persistent-6        45280        43000   -5.04%

R=golang-dev, alex.brainman, coocood, rsc
CC=golang-dev
https://golang.org/cl/7612045

R=golang-dev, bradfitz
CC=adonovan, cw, golang-dev, patrick.allen.higgins
https://golang.org/cl/7956044

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/8012043

R=golang-dev, dave, minux.ma
CC=golang-dev
https://golang.org/cl/7876044

Fixes #5121.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7814046

Perhaps it would make FreeBSD 10-CURRENT/ARM on Raspberry Pi builders happy.

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/8008043

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7510048

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7938046

Detected by GCC static analysis.

Fixes #5117.

R=golang-dev, ality, minux.ma
CC=golang-dev
https://golang.org/cl/7665047

in an effort to make builder freebsd-arm-pi and netbsd-arm-qemu pass again.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/7621050

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7985043

From VisualFC.
Fixes #4862.

R=golang-dev, minux.ma, r
CC=golang-dev
https://golang.org/cl/7568043

An overview is all that's required.

R=golang-dev, remyoudompheng, bradfitz, adg
CC=golang-dev
https://golang.org/cl/7577050

This CL updates CL 7511043;
- adds new test cases for both UDPConn and UnixConn,
- makes sure unnamed UnixAddr handling,
- replaces t.Errorf with t.Fatalf in sockname related test cases.

Fixes #3721 (again).
Fixes #3838 (again).

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7627048

This CL provides IPv6 scoped addressing zone support as defined
in RFC 4007 for internet protocol family connection setups.

Follwoing types and functions allow a literal IPv6 address with
zone identifer as theirs parameter.

pkg net, func Dial(string, string) (Conn, error)
pkg net, func DialOpt(string, ...DialOption) (Conn, error)
pkg net, func DialTimeout(string, string, time.Duration) (Conn, error)
pkg net, func Listen(string, string) (Listener, error)
pkg net, func ListenPacket(string, string) (PacketConn, error)
pkg net, func ResolveIPAddr(string, string) (*IPAddr, error)
pkg net, func ResolveTCPAddr(string, string) (*TCPAddr, error)
pkg net, func ResolveUDPAddr(string, string) (*UDPAddr, error)
pkg net, type IPAddr struct, Zone string
pkg net, type TCPAddr struct, Zone string
pkg net, type UDPAddr struct, Zone string

Also follwoing methods return a literal IPv6 address with zone
identifier string if possible.

pkg net, method (*IPAddr) String() string
pkg net, method (*TCPAddr) String() string
pkg net, method (*UDPAddr) String() string

Fixes #4234.
Fixes #4501.
Update #5081.

R=rsc, iant
CC=golang-dev
https://golang.org/cl/6816116

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/7577049