Fixes one build failure.

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/12139043

There is a chance that the SIGQUIT will make the test process
dump its stacks as part of exiting, which would be nice for
finding out what it is doing.

Right now the builders are occasionally timing out running
the runtime test. I hope this will give us some information
about the state of the runtime.

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/12041051

struct Hmap is the header for a map value.

CL 8377046 made flags a uint32 so that it could be updated atomically,
but that bumped the struct to 56 bytes, which allocates as 64 bytes (on amd64).

hash0 is initialized from runtime.fastrand1, which returns a uint32,
so the top 32 bits were always zero anyway. Declare it as a uint32
to reclaim 4 bytes and bring the Hmap size back down to a 48-byte allocation.

Fixes #5237.

R=golang-dev, khr, khr
CC=bradfitz, dvyukov, golang-dev
https://golang.org/cl/12034047

Fixes #5460.

R=golang-dev, rsc, bradfitz
CC=golang-dev
https://golang.org/cl/12123043

Fixes #5972.

R=golang-dev, adonovan
CC=golang-dev
https://golang.org/cl/12125043

This is mainly to force another build
with goroutine preemption.

R=rsc
CC=golang-dev
https://golang.org/cl/12006045

All known issues with preemption have beed fixed.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/12008044

Do not run Syscall benchmarks under race detector,
they split stack in syscall status.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/12093045

If netFD is closed by finalizer, runtime netpoll descriptor is not freed.

R=golang-dev, dave, alex.brainman
CC=golang-dev
https://golang.org/cl/12037043

Fixes #5598.

R=ken2
CC=golang-dev
https://golang.org/cl/12104043

Not just the first one.

Fixes #5433.
Fixes #5913.

R=ken2
CC=golang-dev
https://golang.org/cl/12028049

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/12091043

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/12082045

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/12050045

EscapeText now escapes 0xFFFD returned from DecodeRune as 0xFFFD, rather than passing through the original byte.
Fixes #5880.

R=golang-dev, r, bradfitz, adg
CC=golang-dev
https://golang.org/cl/11975043

Generated by addca.

R=gobot
CC=golang-dev
https://golang.org/cl/12084043

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/11990043

Fixes #2648.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/11331043

R=adonovan
CC=golang-dev
https://golang.org/cl/12072043

As promised.

TBR=dvyukov
CC=golang-dev
https://golang.org/cl/12063043

R=adonovan
CC=golang-dev
https://golang.org/cl/12062043

I want to see the timing information in build logs,
and we can't see the logs for "ok" builds.
So make the build fail everywhere.

Will roll back immediately.

TBR=dvyukov
CC=golang-dev
https://golang.org/cl/12058046

R=dvyukov
CC=golang-dev
https://golang.org/cl/12028046

Document endian-ness assumption.

R=dvyukov
CC=golang-dev
https://golang.org/cl/12056044

The current failure is:
fatal error: runtime: stack split during syscall
goroutine 2 [stack split]:
_si2v(0xb6ebaebc, 0x3b9aca00)
        /usr/local/go/src/pkg/runtime/vlrt_arm.c:628 fp=0xb6ebae9c
runtime.timediv(0xf8475800, 0xd, 0x3b9aca00, 0xb6ebaef4)
        /usr/local/go/src/pkg/runtime/runtime.c:424 +0x1c fp=0xb6ebaed4

Just adding textflag 7 causes the following error:
notetsleep: nosplit stack overflow
        128	assumed on entry to notetsleep
        96	after notetsleep uses 32
        60	after runtime.futexsleep uses 36
        4	after runtime.timediv uses 56
        -4	after _si2v uses 8

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/12001045

R=adonovan, r
CC=golang-dev
https://golang.org/cl/11961043

The current failure is:
fatal error: runtime: stack split during syscall
goroutine 2 [stack split]:
_addv(0xb6fa0f28, 0xd0a5112e, 0x13156d6e, 0xf8475800, 0xd)
        /usr/local/go/src/pkg/runtime/vlrt_arm.c:66 fp=0xb6fa0ef8
notetsleep(0xb6fa0f9c, 0xf8475800, 0xd, 0x0, 0x0, ...)
        /usr/local/go/src/pkg/runtime/lock_futex.c:156 +0xd0 fp=0xb6fa0f18
runtime.notetsleepg(0xb6fa0f9c, 0xf8475800, 0xd)
        /usr/local/go/src/pkg/runtime/lock_futex.c:197 +0x74 fp=0xb6fa0f3c

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/12052043

notetsleep: nosplit stack overflow
        128	assumed on entry to notetsleep
        80	after notetsleep uses 48
        44	after runtime.futexsleep uses 36
        -12	after runtime.timediv uses 56

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/12049043

notetsleep: nosplit stack overflow
        120	assumed on entry to notetsleep
        96	after notetsleep uses 24
        88	on entry to runtime.semasleep
        32	after runtime.semasleep uses 56
        24	on entry to runtime.nanotime
        -8	after runtime.nanotime uses 32

Nanotime seems to be using only 24 bytes of stack space.
Unless I am missing something.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/12041044

notetsleep: nosplit stack overflow
        120	assumed on entry to notetsleep
        80	after notetsleep uses 40
        72	on entry to runtime.futexsleep
        16	after runtime.futexsleep uses 56
        8	on entry to runtime.printf
        -16	after runtime.printf uses 24

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/12047043

Split stack checks (morestack) corrupt g->sched,
but g->sched must be preserved consistent for GC/traceback.
The change implements runtime.notetsleepg function,
which does entersyscall/exitsyscall and is carefully arranged
to not call any split functions in between.

R=rsc
CC=golang-dev
https://golang.org/cl/11575044

Close netpoll descriptor along with socket.
Ensure that error paths close the descriptor as well.

R=golang-dev, mikioh.mikioh, alex.brainman
CC=golang-dev
https://golang.org/cl/11987043

Fixes #5368.

R=golang-dev, dvyukov
CC=golang-dev, rsc
https://golang.org/cl/11858043

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/11985043

This is in preparation for runtime-integrated network pollster for BSD
variants.

Update #5199

R=golang-dev, fvbommel, dave
CC=golang-dev
https://golang.org/cl/11984043

Fixes #5881.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/11892043

It takes more then 5 minutes to clone go repo
on windows-386 builder now.

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/12007043

This will mean that sub-repositories won't get built against the
release branch. They are often not compatible because the subrepos
often run ahead of the current release (e.g. go.tools is using
new additions to go/ast, and go.net is using new things in syscall)
so there's little point in checking them against cherrypick commits
when they'll be tested against those commits on tip anyway.

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/12001043

Fixes #5677.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/11992043

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/11991043