Fixes build on Plan 9 and Windows.

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7454049

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7429049

Also replaces testing.Errof with testing.Fatalf, make use of ICMP mock.

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/7308058

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/7433044

1. when executing a unsupported VFP instruction, the NetBSD kernel somehow
doesn't report SIGILL, and instead just spin and spin, we add a alarm(2)
to detect this case (albeit this is a kernel bug).
2. NetBSD/ARM's VFP11 support is not complete, so temporarily disable it.
3. The default gcc shipped with NetBSD-current mis-optimizes our code
at -O2, so lower the optimization level to -O1 on NetBSD/ARM.

R=dave, rsc
CC=golang-dev
https://golang.org/cl/7286044

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/7422055

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/7420051

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7445050

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7450050

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/7419048

They are moving to code.google.com/p/go.exp.
See also https://golang.org/cl/7463043

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7456047

Fixes #4826.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/7434046

Fixes #4904.
The problem was that when the test runs the heap had grown to ~100MB,
so GC allows it to grow to 200MB, and so the test fails.
Moving the test to a separate process makes it much more isolated and stable.

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7441046

Fixes #4952.

R=alex.brainman
CC=golang-dev
https://golang.org/cl/7445046

More robustness in case of incorrect programs.

Fixes #4962.

R=dsymonds
CC=golang-dev
https://golang.org/cl/7429047

swig >= 2.0.9 requires the size of int values to be passed via a command line flag. Should swig complain about the -intgosize not being supported, then alert the user to their outdated version of swig.

Fixes #4756.

R=golang-dev, minux.ma, iant
CC=golang-dev
https://golang.org/cl/7331048

Replacement for CL 7370053 which attempted to make fallthrough's
syntactically a part of switch statements. Because they may be
labeled, fixing that CL completely would require too much spec
surgery.

Fixes #4923.

R=r, iant, rsc, ken
CC=golang-dev
https://golang.org/cl/7416048

Also make the crossover point an architecture-dependent constant,
although it's the same everywhere for now.

BenchmarkAppendStr1Byte            416          145  -65.14%
BenchmarkAppendStr4Bytes           743          217  -70.79%
BenchmarkAppendStr8Bytes           421          270  -35.87%
BenchmarkAppendStr16Bytes          415          403   -2.89%
BenchmarkAppendStr32Bytes          415          391   -5.78%

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7459044

Update #3679.

BenchmarkAppend1Byte            484          199  -58.88%
BenchmarkAppend4Bytes           829          286  -65.50%
BenchmarkAppend8Bytes           484          365  -24.59%
BenchmarkAppend16Bytes          484          498   +2.89%
BenchmarkAppend32Bytes          486          484   -0.41%

R=iant, dave, rsc
CC=golang-dev
https://golang.org/cl/7443047

Fixes #4961.

R=golang-dev, r, minux.ma
CC=golang-dev
https://golang.org/cl/7443048

Fixes #4945.
Most examples in this issue now better, but #10 is incomplete and I'm not
certain how to reproduce it. It actually looks like a go/types problem, since
the type being reported is coming directly from that package.
Please reopen the issue if you disagree.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7448046

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7450049

Update #4961.

R=golang-dev
CC=golang-dev
https://golang.org/cl/7451044

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7429046

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7447044

R=gri, rsc
CC=golang-dev
https://golang.org/cl/7422051

Also: add support for pointer conversions, covered by one new test.

R=gri, bradfitz, dave
CC=golang-dev
https://golang.org/cl/7435047

Bridge methods for embedded interfaces were
passing the interface twice: once as receiver,
once as first param.
Covered by $GOROOT/test/ddd.go.

Also:
- invent names ("arg%d") for parameters if missing.
- refactoring: move common code for bridge methods into
  createParams and emitTailCall.

R=gri
CC=golang-dev
https://golang.org/cl/7437047

Update #4878.

R=golang-dev
CC=golang-dev
https://golang.org/cl/7450048

Update #4958.

R=golang-dev
CC=golang-dev
https://golang.org/cl/7434047

R=golang-dev
CC=golang-dev
https://golang.org/cl/7438052

Update #4955.

R=golang-dev
CC=golang-dev
https://golang.org/cl/7435049

Update #4956.

R=golang-dev
CC=golang-dev
https://golang.org/cl/7417048

Putting the M initialization in multiple places will not scale.
Various code assumes mstart is the start already. Make it so.

R=golang-dev, devon.odell
CC=golang-dev
https://golang.org/cl/7420048

Move the mstartfn into its own field.
Simpler, more likely to be correct.

R=golang-dev, devon.odell
CC=golang-dev
https://golang.org/cl/7414046

R=devon.odell
CC=golang-dev
https://golang.org/cl/7443046

Fixes #4948.

R=golang-dev, alex.brainman
CC=golang-dev
https://golang.org/cl/7445045

This time for sure.

R=golang-dev
CC=golang-dev
https://golang.org/cl/7449045

Distribute runnable queues, memory cache
and cache of dead G's per processor.
Faster non-blocking syscall enter/exit.
More conservative worker thread blocking/unblocking.

R=dave, bradfitz, remyoudompheng, rsc
CC=golang-dev
https://golang.org/cl/7314062

There is a #pragma dynexport crosscall2, to help SWIG,
and 6l cannot export the symbol if it doesn't get to see it.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7448044