- Rename sys_sched_yield() to osyield() as this is now defined in asm.h.
- Only print kern.rtheads message if rfork_thread() failed with ENOTSUP.
- Remove unused variables.

R=rsc
CC=golang-dev
https://golang.org/cl/4973043

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4966045

gc/bits.c
. improved format with associated cast;
gc/closure.c
gc/dcl.c
gc/range.c
gc/reflect.c
gc/sinit.c
. dropped unnecessary assignments;
gc/gen.c
. dropped unnecessary assignment;
. added static qualifier to local function definition;
gc/go.h
. added varargck pragmas;
gc/lex.c
. used {} instead of ; in if statement to suppress warning;
. replaced exit(0) with exits(0);
. added compilation conditions for SIGBUS/SIGSEGV;
. dropped unnecessary assignment;
gc/mparith2.c
. dropped four unnecessary assignments/initialisations;
gc/obj.c
. added type cast to local pointer;
gc/pgen.c
. added cast and related print format;
gc/subr.c
. replaced exit(1) with exits("error");
. replaced unlink() with remove();
. renamed local cistrmp() as ucistrmp() to remove conflict with
  Plan 9 function by the same name;
gc/swt.c
. added braces instead of ; as empty statment;
gc/typecheck.c
. added static qualifier to local function definition;
. dropped unnecessary assignments;
gc/walk.c
. dropped unnecessary assignments;
. added static qualifier to local function definitions;

R=rsc
CC=golang-dev
https://golang.org/cl/4964046

src/cmd/6g/cgen.c
src/cmd/6g/gobj.c
src/cmd/6g/reg.c
. dropped unused assignments;
src/cmd/6g/gg.h
. added varargck pragmas;
src/cmd/6g/list.c
. adjusted print format for ulong casts;
src/cmd/6g/peep.c
. dropped redundant increment;

R=golang-dev
CC=golang-dev, rsc
https://golang.org/cl/4953049

5g/cgen.c:
. USED(n4) as it is only mentioned in unreachable code later;
. dropped unused assignments;
. commented out unreachable code;
5g/cgen64.c:
5g/ggen.c:
. dropped unused assignments of function return value;
5g/gg.h:
. added varargck pragmas;
5g/peep.c:
. USED(p1) used only in unreacheable code;
. commented out unreachable code;
5g/reg.c:
. dropped unused assignment;

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4953048

R=adg
CC=golang-dev
https://golang.org/cl/4971043

In amd64 it is the caller who cleans the stack.

R=alex.brainman, vcc.163, jp
CC=golang-dev
https://golang.org/cl/4966046

R=alex.brainman, golang-dev
CC=golang-dev
https://golang.org/cl/4968048

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4951046

Escape analysis was incorrectly assuming that
functions without bodies don't leak their
parameters.  This meant that sync/atomic's
TestAddInt64 was allocating x on its stack,
and then x was not properly aligned for use
with the atomic 64-bit instructions.  Obviously
we should figure out the alignment story on 5g
too, but this fix is correct and should restore the
build to 'ok'.

TBR=lvd
CC=golang-dev
https://golang.org/cl/4964047

Also standardize on 'utf8' as encoding name.
Apparently either is acceptable.

The user, because it is a StringProperty,
must be of type unicode in order to handle
Unicode correctly.  It must *not* have type string.

The desc, because it is a BlobProperty, must
be of type string in order to handle Unicode correctly.
It must *not* have type unicode.

Yay encoding type pedantry without static typing.

R=adg, mattn.jp
CC=golang-dev
https://golang.org/cl/4973045

cdecl calbacks have been implemented in C/ASM code, just Go function is missing

R=golang-dev, alex.brainman
CC=golang-dev
https://golang.org/cl/4969047

-s now means *disable* escape analysis.

Fix escape leaks for struct/slice/map literals.
Add ... tracking.
Rewrite new(T) and slice literal into stack allocation when safe.

Add annotations to reflect.
Reflect is too chummy with the compiler,
so changes like these affect it more than they should.

R=lvd, dave, gustavo
CC=golang-dev
https://golang.org/cl/4954043

R=rsc
CC=golang-dev, jp, vcc.163
https://golang.org/cl/4926042

R=golang-dev
CC=golang-dev, rsc
https://golang.org/cl/4950050

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