Performance improvement aside, time.Now() now gets real nanosecond resolution
on supported systems.

Benchmark done on Core i7-2600 @ 3.40GHz with kernel 3.5.2-gentoo.
original vDSO gettimeofday:
BenchmarkNow    100000000               27.4 ns/op
new vDSO gettimeofday fallback:
BenchmarkNow    100000000               27.6 ns/op
new vDSO clock_gettime:
BenchmarkNow    100000000               24.4 ns/op

R=golang-dev, bradfitz, iant, iant
CC=golang-dev
https://golang.org/cl/6814103

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/6819117

It also passes on FreeBSD.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/6812103

Fixes the test to work correctly on other platforms with
64-bit ints, like Alpha.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/6822099

Fixes #4358.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6840043

When exporting a body containing
        x, ok := v.(Type)

the definition for Type was not being included, so when the body
was actually used, it would cause an "unknown type" compiler error.

Fixes #4370.

R=ken2
CC=golang-dev
https://golang.org/cl/6827064

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/6813101

R=golang-dev, remyoudompheng, iant, rsc
CC=golang-dev
https://golang.org/cl/6833043

Re-enable the crash tests on NetBSD now that the issue has been
identified and fixed.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/6813100

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/6819107

Integrates with the pollserver now.

Uses the old implementation on windows and plan9.

Fixes #2631

R=paul, iant, adg, bendaglish, rsc
CC=golang-dev
https://golang.org/cl/6815049

This is blocking me submitting the net fd timeout
CL, since goapi chokes on my constant.

The much more extensive fix to goapi's type checker
in pending review in https://golang.org/cl/6742050

But I'd rather get this quick fix in first.

R=golang-dev, mikioh.mikioh
CC=golang-dev
https://golang.org/cl/6818104

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6818106

R=golang-dev, dave, rsc
CC=golang-dev
https://golang.org/cl/6820115

Intel Core 2 Duo (2.16 GHz) running 3.6.5-1-ARCH

benchmark       old ns/op    new ns/op    delta
BenchmarkNow         1856         1034  -44.29%

R=rsc
CC=golang-dev
https://golang.org/cl/6826072

R=golang-dev, r
CC=dvyukov, golang-dev
https://golang.org/cl/6810099

Fixes GOARCH=386 build.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6810098

R=r, dsymonds
CC=golang-dev
https://golang.org/cl/6826070

Fixes #4337.

R=r, minux.ma
CC=golang-dev
https://golang.org/cl/6814098

Fixes #4359.

R=golang-dev, daniel.morsing, rsc
CC=golang-dev
https://golang.org/cl/6834043

Update #4358
Still to do: support binary numeric format in Reader.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6818101

Fixes #4094.
Fixes #4353.

R=golang-dev, dave, rsc
CC=golang-dev
https://golang.org/cl/6810090

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6821069

Running this test via "bash run" uncovered three different
bugs (4344, 4348, 4353).  We need to run it by default.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6832043

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/6811092

The code assumed that the only choices were EscNone, EscScope, and EscHeap,
so that it makes sense to set EscScope only if the current setting is EscNone.
Now that we have the many variants of EscReturn, this logic is false, and it was
causing important EscScopes to be ignored in favor of EscReturn.

Fixes #4360.

R=ken2
CC=golang-dev, lvd
https://golang.org/cl/6816103

This is copy of https://golang.org/cl/6810080
but sent from another account (dvyukov@gmail.com is not in CONTRIBUTORS).

R=rsc
CC=golang-dev
https://golang.org/cl/6827060

The old code worked with gc, I assume because the linker
unified identical strings, but it failed with gccgo.

R=rsc
CC=gobot, golang-dev
https://golang.org/cl/6826063

The current implement can fail when the
block size is not a multiple of 8 bytes.
This CL makes it work, and also checks that the
data is in fact a multiple of the block size.

R=agl, agl
CC=golang-dev
https://golang.org/cl/6827058

Avoids problems with local declarations shadowing other names.
We write a more explicit form than the incoming program, so there
may be additional type annotations. For example:

        int := "hello"
        j := 2

would normally turn into

        var int string = "hello"
        var j int = 2

but the int variable shadows the int type in the second line.

This CL marks all local variables with a per-function sequence number,
so that this would instead be:

        var int·1 string = "hello"
        var j·2 int = 2

Fixes #4326.

R=ken2
CC=golang-dev
https://golang.org/cl/6816100

R=ken
CC=golang-dev
https://golang.org/cl/6815073

The protocol number of ICMP for IPv6 is 58, not 1.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/6810093

Currently race detector runtime maps shadow memory eagerly at process startup.
It works poorly on Windows, because Windows requires reservation in swap file
(especially problematic if several Go program runs at the same, each consuming GBs
of memory).
With this change race detector maps shadow memory lazily, so Go runtime must notify
about all new heap memory.
It will help with Windows port, but also eliminates scary 16TB virtual mememory
consumption in top output (which sometimes confuses some monitoring scripts).

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6811085

Fixes #4307.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6822073

Current racewalk transformation looks like:
x := <-makeChan().c
\/\/\/\/\/\/\/\/\/
runtime.raceread(&makeChan().c)
x := <-makeChan().c
and so makeChan() is called twice.
With this CL the transformation looks like:
x := <-makeChan().c
\/\/\/\/\/\/\/\/\/
chan *tmp = &(makeChan().c)
raceread(&*tmp)
x := <-(*tmp)
Fixes #4245.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6822075

It is refactoring towards generic walk
+ it handles mode nodes.
Partially fixes 4228 issue.

R=golang-dev, lvd, rsc
CC=golang-dev
https://golang.org/cl/6775098

Thank you zhoumichaely for original CL 5175042.

Fixes #1740.
Fixes #2315.

R=golang-dev, bradfitz, mikioh.mikioh
CC=golang-dev, zhoumichaely
https://golang.org/cl/6822045

Benchmarks:

benchmark              old ns/op    new ns/op    delta
BenchmarkHash8Bytes          762          674  -11.55%
BenchmarkHash1K             8791         7375  -16.11%
BenchmarkHash8K            65094        54881  -15.69%

benchmark               old MB/s     new MB/s  speedup
BenchmarkHash8Bytes        10.50        11.86    1.13x
BenchmarkHash1K           116.48       138.84    1.19x
BenchmarkHash8K           125.85       149.27    1.19x

R=dave, rsc, iant
CC=golang-dev
https://golang.org/cl/6820096

R=golang-dev, nigeltao
CC=golang-dev
https://golang.org/cl/6812095

A check for smallintconst was missing before generating the
comparisons.

Fixes #4348.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6815088