For expressions where the result type is independent
of the argument types (comparisons, conversions, rhs
of shifts), set the final expression types for those
subtrees early.

This fixes several bugs where incorrect lhs shift
operands where used (say in a comparison), but were
not reported.

Together with the changes listed below this CL fixes
many type-checker bugs.

Also:
- better documented updateExprType
- added larger comment to expr.go explaining
  the basic expression checking algorithm
- use latest definition for indices and make
  arguments; use the same code to check both
- use the same mechanism for cycle detection
  in constant expressions as for variables
  (new field Constant.visited)
- more tests for complex and make builtins
- many more and systematic tests for shifts;
  moved them into separate testfile
- in the testing code, don't compare the
  expected error pattern against itself
  (the actual message was always ignored...)
- fix affected error patterns in the test files
- various cleanups along the way

R=adonovan
CC=golang-dev
https://golang.org/cl/7432051

Generated by addca.

R=gobot
CC=golang-dev
https://golang.org/cl/7544044

lib9: fix runcmd, removeall, and tempdir functions

cmd/dist: Include run_plan9.c and tempdir_plan9.c
        from lib9 for build, and in general consider
        file names containing "plan9" for building.

cmd/ld: provide function args for the new functions
        from lib9.

R=rsc, rminnich, ality, bradfitz
CC=golang-dev
https://golang.org/cl/7666043

Method calls on interfaces with large stored values
will call the pointer receiver method which may be
a wrapper over a method with value receiver.

This is particularly inefficient for very small bodies.
Inlining the wrapped method body saves a potentially expensive
function call.

benchmark                old ns/op    new ns/op    delta
BenchmarkSortString1K       802295       641387  -20.06%
BenchmarkSortInt1K          359914       238234  -33.81%
BenchmarkSortInt64K       35764226     22803078  -36.24%

Fixes #4707.

R=golang-dev, daniel.morsing, rsc
CC=golang-dev
https://golang.org/cl/7214044

R=golang-dev, daniel.morsing
CC=golang-dev
https://golang.org/cl/7722043

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7624044

This includes a simplified resolvePath function and tests for all normal and abnormal path resolution examples described in RFC 3986, sections 5.4.1 and 5.4.2 [1]. Some of those examples failed before (see http://play.golang.org/p/F0ApSaXniv).

Also, parsing a reference "//foo" now works as expected. It was treated as an absolute path with very weird results (see http://play.golang.org/p/089b-_xoNe).

During path resolution, all dot segments are removed as described by the RFC.

A few existing tests had to be changed because they expected the wrong output.

Fixes #4700.

Fixes #4706.

[1] http://tools.ietf.org/html/rfc3986#section-5.4.1

R=rsc, adg, bradfitz
CC=golang-dev
https://golang.org/cl/7203059

Generated by addca.

R=gobot
CC=golang-dev
https://golang.org/cl/7526045

Fixes #4987.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7713043

Fixes #5022

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7712043

Ton of FreeBSD syscall constants.

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7476046

Fixes #2735

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7470048

Only clever enough to allow concurrent stress testing.

R=mikioh.mikioh, rsc
CC=golang-dev
https://golang.org/cl/7703044

R=golang-dev, minux.ma, bradfitz
CC=golang-dev
https://golang.org/cl/7704043

R=golang-dev, bradfitz, dvyukov
CC=golang-dev
https://golang.org/cl/7702043

The same rules apply for make arguments.

R=r, rsc, iant, ken
CC=golang-dev
https://golang.org/cl/7656043

For details see the cited issue.

Fixes #4793.

R=rsc, r, iant, ken
CC=golang-dev
https://golang.org/cl/7524044

428 Precondition Required
429 Too Many Requests
431 Request Header Fields Too Large
511 Network Authentication Required

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7678043

Generated by addca.

R=gobot
CC=golang-dev
https://golang.org/cl/7700043

The variable is named b not bit.

R=golang-dev, agl
CC=golang-dev
https://golang.org/cl/7699043

Fixes #4878.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7420052

R=ken2
CC=golang-dev
https://golang.org/cl/7694043

Let's just see what breaks.

R=golang-dev, bradfitz, adg
CC=golang-dev
https://golang.org/cl/7693043

R=ken2
CC=golang-dev
https://golang.org/cl/7626045

R=ken2, ken
CC=golang-dev
https://golang.org/cl/7483045

Tell Windows users how to update Mercurial's library.zip to add some missing dependencies.

Fixes #4745.

R=golang-dev, patrick.allen.higgins, minux.ma, adg
CC=golang-dev
https://golang.org/cl/7558043

"go build" and "go install" were mixing stdout and stderr
from the toolchain, then putting it all on stdout. With this
change, it stays mixed, and is sent to stderr. Because
the toolchain does not create output in a clean compile/install,
sending all output to stderr makese more sense.

Also fix test.bash because of "mktemp: too few X's
in template `testgo'" on Linux.

Fixes #4917.

R=golang-dev, rsc, adg
CC=golang-dev
https://golang.org/cl/7393073

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/7690043

Dynimpname was getting too confusing.
Replace flag-like checks with tests of s->type.

R=ken2
CC=golang-dev
https://golang.org/cl/7594046

Also move symbol names onto lines by themselves: some are very long.
Show relocations.

R=ken2
CC=golang-dev
https://golang.org/cl/7689043

This makes binaries work with OS X nm.

R=ken2
CC=golang-dev
https://golang.org/cl/7558044

I guess it would be too much to ask for gcc on my machine to give
the same errors as gcc on the builder machines.

R=ken2
CC=golang-dev
https://golang.org/cl/7686044

This brings Mach-O generation more in line with ELF generation.

Having separate sections for the symtab and pclntab mean that we
can find them that way, instead of using the deprecated debug segments.
(And the host linker will keep separate sections for us, but probably
not the debug segments.)

R=ken2
CC=golang-dev
https://golang.org/cl/7688043

R=ken2
CC=golang-dev
https://golang.org/cl/7497044

Fixes #4869.
Fixes #5007.
Update #5005.

R=golang-dev, 0xe2.0x9a.0x9b, bradfitz
CC=golang-dev
https://golang.org/cl/7534044

Previously it was evaluated once, so re-using the timeout option
repeatedly would always generate the same deadine.

Also switch to doing just one pass over the options, making
the private interface actually useful.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/7608045

myrtle$ go version
go version devel +d533352b414d Sat Mar 09 05:39:15 2013 +0100 netbsd/386
myrtle$ time go test -ldflags -hostobj ../misc/cgo/test
ok      _/var/project/GoLang/misc/cgo/test      10.962s
   68.63s real    49.60s user    19.06s system
myrtle$ uname -a
NetBSD myrtle.plan9.local 6.0_BETA2 NetBSD 6.0_BETA2 (GENERIC) i386

R=rsc
CC=golang-dev
https://golang.org/cl/7641047

Tested on FreeBSD 9.1 amd64, per rsc's instructions at
https://groups.google.com/d/topic/golang-dev/HjRTLvRsJXo/discussion .

R=golang-dev, lucio.dere, devon.odell, rsc
CC=golang-dev
https://golang.org/cl/7664044

Generated by addca.

R=gobot
CC=golang-dev
https://golang.org/cl/7608044

Update #4929

Regenerated from FreeBSD-9.1 for amd64 and 386, FreeBSD-CURRENT for arm.

R=devon.odell, minux.ma, rsc
CC=golang-dev
https://golang.org/cl/7438053