Use methods for key questions.
Provide access to non-portable pieces through portable methods.
Windows and Plan 9 updated.

R=golang-dev, bradfitz, bradfitz, r, dsymonds, rsc, iant, iant
CC=golang-dev
https://golang.org/cl/5673077

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/5686049

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5685061

Fixes #2935.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5684048

Fixes #2777

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5685060

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5688047

R=rsc, mikioh.mikioh
CC=golang-dev
https://golang.org/cl/5689046

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5687052

Fixes #3013.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5683049

The alternative is to record enough information that the
trap handler know which registers contain cached globals
and can flush the registers back to their original locations.
That's significantly more work.

This only affects globals that have been written to.
Code that reads from a global should continue to registerize
as well as before.

Fixes #1304.

R=ken2
CC=golang-dev
https://golang.org/cl/5687046

This broke a build on a Linux box I hadn't updated
in awhile. The hgignore files were preventing hg status
from showing and hg purge from cleaning up junk.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5687048

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5685051

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5688048

Embedded Go images in the installer dialog and
banner boxes, Go tree cloning uses version info
from the Go tool (readme updated), the installer
allows up/down-grading and reparing of the version
that's installed, added two registry values.

R=golang-dev, bradfitz, bradfitz
CC=golang-dev
https://golang.org/cl/5683048

They are portability problems and the options are almost always zero in practice anyway.

R=golang-dev, dsymonds, r, bradfitz
CC=golang-dev
https://golang.org/cl/5688046

Added the (properly formatted) license file back,
the installer adds go\bin to the system PATH now,
the output package names are in line with the linux
and darwin versions, dist.bat extracts GOARCH in a
sane way, readme cleanup.

Tested on Windows 7 only. It would be helpful if
someone else could give it a try. See the readme
for details.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5673099

-- add driver.Value type and documentation,
   convert from interface{} to Value where
   appropriate.
-- don't say "subset" anywhere,
-- SubsetValuer -> Valuer
-- SubsetValue -> Value
-- IsParameterSubsetType -> IsValue
-- IsScanSubsetType -> IsScanValue

Fixes #2842

R=golang-dev, r, rsc
CC=golang-dev
https://golang.org/cl/5674084

While we're here, get rid of the old names for the escaping functions.

Fixes #3073.

R=golang-dev, dsymonds, rsc
CC=golang-dev
https://golang.org/cl/5685049

My theory is that the call to f() allocates, which triggers
a garbage collection, which itself may do some allocation,
which is being counted.  Running a garbage collection
before starting the test should avoid this problem.

Fixes #2894 (I hope).

R=golang-dev, bradfitz, nigeltao
CC=golang-dev
https://golang.org/cl/5685046

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5683046

R=golang-dev, nigeltao
CC=golang-dev
https://golang.org/cl/5683045

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5685048

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5676099

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5689043

Fixes #2893.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5685047

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5684046

ARM doesn't have the concept of scale, so I renamed the field
Addr.scale to Addr.flag to better reflect its true meaning.

R=rsc
CC=golang-dev
https://golang.org/cl/5687044

Fixes #2890.

R=golang-dev, r, remyoudompheng
CC=golang-dev
https://golang.org/cl/5683044

Fixes #1834.

R=rsc, alex.brainman
CC=golang-dev
https://golang.org/cl/5673068

Fix all the local links, as contrib.html is served as
/project/

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/5656105

R=golang-dev, dsymonds, r
CC=golang-dev
https://golang.org/cl/5685043

Fixes #3072.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5684044

It's testing an old property of the language and is no longer relevant.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5676104

which is trailing commas in literals. They were gofmted away at some point.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5673103

It's in an odd style and it's unclear what true purpose it serves as
a test other than to be another Go program.

R=gri
CC=golang-dev
https://golang.org/cl/5674111

* disallow embedding of C type (Fixes issue 2552)
* detect 0-length array (Fixes issue 2806)
* use typedefs when possible, to avoid attribute((unavailable)) (Fixes issue 2888)
* print Go types constructed from C types using original C types (Fixes issue 2612)

This fix changes _cgo_export.h to repeat the preamble from import "C".
Otherwise the fix to issue 2612 is impossible, since it cannot refer to
types that have not been defined.  If people are using //export and
putting non-header information in the preamble, they will need to
refactor their code.

R=golang-dev, r, r
CC=golang-dev
https://golang.org/cl/5672080

R=r, r, rsc
CC=golang-dev
https://golang.org/cl/5656108

R=rsc
CC=golang-dev
https://golang.org/cl/5677095

morebuf holds a pc/sp from the last stack split or
reflect.call or panic/recover.  If the pc is a closure,
the reference will keep it from being collected.

moreargp holds a pointer to the arguments from the
last stack split or reflect.call or panic/recover.
Normally it is a stack pointer and thus not of interest,
but in the case of reflect.call it is an allocated argument
list and holds up the arguments to the call.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5674109

The garbage collector can avoid scanning this section, with
reduces collection time as well as the number of false positives.
Helps a little bit with issue 909, but certainly does not solve it.

R=ken2
CC=golang-dev
https://golang.org/cl/5671099