8g/cgen.c:
8g/gobj.c
. dropped unnecessary assignments;
8g/gg.h
. added varargckk pragmas;
8g/ggen.c
. dropped duplicate assignment;
8g/gsubr.c
. adjusted format in print statement;
. dropped unnecessary assignment;
. replaced GCC's _builtin_return_address(0) with Plan 9's
  getcallerpc(&n) which is defined as a macro in <u.h>;
8g/list.c
. adjusted format in snprint statement;
8g/opt.h
. added varargck pragma (Adr*) that is specific for the invoking
  modules;
8g/peep.c
. dropped unnecessary incrementation;

R=rsc
CC=golang-dev
https://golang.org/cl/4974044

R=rsc
CC=golang-dev, vcc.163
https://golang.org/cl/4963044

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/4966044

The fix is to add ' ' after ';' so that we match
what we used to generate.
Packages like http look for the string with
the space in it, and I don't see a reason to
be so terse.

Also s/buffer/b/

TBR=bradfitz
CC=golang-dev
https://golang.org/cl/4959044

TeeReader is a Reader that writes what it reads.

R=rsc, bradfitz
CC=golang-dev
https://golang.org/cl/4953041

Enforce + document the UTF-8 default.

R=rsc, bradfitz, adg
CC=golang-dev
https://golang.org/cl/4627049

R=bradfitz, rsc
CC=golang-dev
https://golang.org/cl/4654069

R=rsc
CC=golang-dev
https://golang.org/cl/4826041

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4972043

R=mikioh.mikioh, rsc
CC=golang-dev
https://golang.org/cl/4954047

Doing a socket/listen on an unspecified address with an unspecified
address family is likely to result in an AF_INET6 socket on an IPv6
capable system, which under OpenBSD means IPv6 only - not IPv4 *and*
IPv6. In this case trying to connect to this socket from an IPv4
loopback address is not going to end well.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4807057

Factor out sleep interrupt.

Fixes #1109.

R=alex.brainman, go.peter.90, mattn.jp
CC=golang-dev
https://golang.org/cl/4968041

Fixes #2119

R=m.n.summerfield, adg, kevlar, rsc, gustavo, n13m3y3r
CC=golang-dev
https://golang.org/cl/4941042

When the encoder was updated to respect the ",omitempty"
struct tag options, the decoder half was never updated to know
about the new struct tag format. (the format is now an optional
name, followed by zero or more ",option" strings)

This only affected people who used ",omitempty" along with
a field name. In that case, the serialized JSON wouldn't
decode to the original value.

R=golang-dev, dvyukov
CC=golang-dev
https://golang.org/cl/4965049

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/4964043

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/4965048

This introduces new APIs.
- DialConfig can open client connection using Config, so user can specify protocol version, tls.Config if necessary.

- Message can be used to send/receive text/binary data in a frame.
- JSON can be used to send/receive JSON data in a frame.

R=golang-dev, adg, rsc, m, tarmigan, raul.san, yohcop
CC=golang-dev
https://golang.org/cl/4635084

R=golang-dev, alex.brainman
CC=golang-dev
https://golang.org/cl/4955042

Write to image.*.Pix directly in the case of RGB, RGBA and NRGBA
images. For the latter two, the file format matches the memory layout
so a simple copy can be used.

RGB image before/after:
tiff.BenchmarkDecoder	748137 ns/op (62.39 MB/s)	251256 ns/op (185.76 MB/s)	x3.0

NRGBA image before/after:
tiff.BenchmarkDecoder	775540 ns/op (80.12 MB/s)	116721 ns/op (532.34 MB/s)	x6.6

R=nigeltao
CC=golang-dev
https://golang.org/cl/4929046

R=nigeltao
CC=golang-dev
https://golang.org/cl/4917049

- implemented stand-alone Throttle mechanism
- added new flag -index_throttle to godoc
- index throttling enables index creation when running
  godoc on app engine as it keeps godoc responsive

R=rsc, dsymonds, adg
CC=golang-dev
https://golang.org/cl/4963043

This fixes goinstall so it doesn't try to install unneeded
packages or get confused with non-existent loops.

R=golang-dev, adg, gustavo
CC=golang-dev
https://golang.org/cl/4958046

R=rsc
CC=golang-dev
https://golang.org/cl/4968044

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4957043

Fixes #2175.

R=alex.brainman, rsc, gustavo, adg
CC=golang-dev
https://golang.org/cl/4929047

This makes decimal a good test
case for the escape analysis.

With escape analysis:

benchmark                 old ns/op    new ns/op    delta
BenchmarkAtof64Decimal         1954          243  -87.56%
BenchmarkAtof64Float           2008          293  -85.41%
BenchmarkAtof64FloatExp       10106         8814  -12.78%
BenchmarkAtof64Big             5113         3486  -31.82%

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/4861042

Also update $GOARM description.

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/4972041

R=ken2
CC=golang-dev
https://golang.org/cl/4971042

#include "go.h" (or "gg.h")

becomes

#include <u.h>
#include <libc.h>
#include "go.h"

so that go.y can #include <stdio.h>
after <u.h> but before "go.h".
This is necessary on Plan 9.

R=ken2
CC=golang-dev
https://golang.org/cl/4971041

Found with gcc 4.6 -Wunused -Wextra
but should be applicable to Plan 9 too.

R=ken2
CC=golang-dev
https://golang.org/cl/4958044

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4944043

Probably will spark some discussion.  ☺

R=lvd
CC=golang-dev
https://golang.org/cl/4948041

RFC2616 says servers should return this status code when
rejecting requests that are too large.

http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.14

R=bradfitz
CC=golang-dev
https://golang.org/cl/4962041

R=mikesamuel
CC=golang-dev
https://golang.org/cl/4956042

The following testcases now pass:

`<a href=x` tests that we do not error on partial unquoted attrs.
`<a href=x ` tests that spaces do end unquoted attrs on spaces.
`<a href=''` tests that we recognize the end of single quoted attrs.
`<a href=""` tests that we recognize the end of double quoted attrs.

R=golang-dev, nigeltao
CC=golang-dev
https://golang.org/cl/4932051

R=rsc
CC=golang-dev
https://golang.org/cl/4941047

Fixes #2182

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/4952041

Fixes #2164.

R=r, rsc
CC=golang-dev
https://golang.org/cl/4927043

Scanning "0" with detected base did not actually set the nat to 0.

R=gri
CC=golang-dev
https://golang.org/cl/4923050

Merge escassign(N, x), escassign(x, N), escexpr(n), and escstmt(n) into esc(n).

1. Renaming
https://golang.org/cl/4917050/diff2/1:2001/src/cmd/gc/esc.c

2. Merging.
https://golang.org/cl/4917050/diff2/2001:4001/src/cmd/gc/esc.c

3. Simplify esccall.
https://golang.org/cl/4917050/diff2/4001:5002/src/cmd/gc/esc.c

R=lvd
CC=golang-dev
https://golang.org/cl/4917050