The sanity checking in pass 2 is wrong
when a select is offering to communicate in
either direction on a channel and neither case
is immediately ready.

R=ken2
CC=golang-dev
https://golang.org/cl/3991047

The old heap maps used a multilevel table, but that
was overkill: there are only 1M entries on a 32-bit
machine and we can arrange to use a dense address
range on a 64-bit machine.

The heap map is in bss.  The assumption is that if
we don't touch the pages they won't be mapped in.

Also moved some duplicated memory allocation
code out of the OS-specific files.

R=r
CC=golang-dev
https://golang.org/cl/4118042

delete reference to Debug function.

R=rsc
CC=golang-dev
https://golang.org/cl/4063048

Also clean up the code, make it more regular.

Fixes #1416.

R=rsc
CC=golang-dev
https://golang.org/cl/3985047

- complex numbers now supported.
- entirely independent of standard decode code.
- parser has no read-ahead; that is, the scanning works
simply by reading the values as they arrive, not by trying
to count bytes for message boundaries, a proof of concept
for the pending rewrite of the regular decoder.

R=rsc, r2
CC=golang-dev
https://golang.org/cl/4084044

make test.sh runnable as a command.
announce only on 127.0.0.1.
rebuild final-test.bin when final-test.go changes.

R=adg, r
CC=golang-dev
https://golang.org/cl/4030044

This bug prevented files such as READMEs etc. from being included in the index.
For instance, now author names recorded in the AUTHORS file can be found with
a godoc query.

R=rsc, r2
CC=golang-dev
https://golang.org/cl/4005047

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4000046

Add intended changes for close + closed, commented out.

R=golang-dev, niemeyer, r, gri1
CC=golang-dev
https://golang.org/cl/4013045

The linker avoids a GOT indirection by turning a MOV into
a LEA, but with x86-64 GCC has started emitting CMOV*
instructions which break the existing logic.

This will generate errors such as:

  unexpected GOT reloc for non-dynamic symbol luaO_nilobject_

The CMOV* instructions may be emitted with normal code like:

  if (o >= L->top) return cast(TValue *, luaO_nilobject);
  else return o;

Which gets compiled into (relocation offset at 1b):

  13: 48 3b 47 10             cmp    0x10(%rdi),%rax
  17: 48 0f 43 05 00 00 00    cmovae 0x0(%rip),%rax
  1e: 00

This change will allow the indirection through the GOT to
avoid the problem in those cases.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4071044

R=rsc, brainman, mattn
CC=golang-dev
https://golang.org/cl/4022043

R=rsc
CC=golang-dev
https://golang.org/cl/4102043

R=bradfitz, dsymonds, r2, dangabrad, rsc
CC=golang-dev
https://golang.org/cl/4043043

R=golang-dev, dsymonds, adg
CC=golang-dev
https://golang.org/cl/4102044

R=adg
CC=golang-dev
https://golang.org/cl/3990045

R=rsc
CC=golang-dev
https://golang.org/cl/4029046

godoc uses this to provide full text index position information for
non-Go files.

R=rsc
CC=golang-dev
https://golang.org/cl/4041045

Fixes #1446.

R=rsc
CC=golang-dev
https://golang.org/cl/3981043

R=rsc, bradfitzgo
CC=golang-dev
https://golang.org/cl/4087043

Make sure we export the channels before we try to import
them.

R=r
CC=golang-dev
https://golang.org/cl/4077046

Thanks to Mike Beller for identifying the problem.

Fixes #1442.

R=bradfitz, bradfitzgo
CC=golang-dev
https://golang.org/cl/4102042

Fixes #1445.

R=r, rsc, iant, ken2
CC=golang-dev
https://golang.org/cl/4109041

R=rsc
CC=golang-dev
https://golang.org/cl/4061045

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4114041

TBR=adg
CC=golang-dev
https://golang.org/cl/4092042

TBR=adg
CC=golang-dev
https://golang.org/cl/4077045

R=adg
CC=golang-dev
https://golang.org/cl/3982051

R=agl1, bradfitzwork, rsc
CC=golang-dev
https://golang.org/cl/4066043

It is unmaintained and untested, and I think it's broken too.
It was a toy to show that Go can run on real hardware,
and it served its purpose.

The source code will of course remain in the repository
history, so it could be brought back if needed later.

R=r, r2, uriel
CC=golang-dev
https://golang.org/cl/3996047

R=mattn
CC=golang-dev
https://golang.org/cl/4034046

Fixes #1444.

R=rsc, r
CC=golang-dev
https://golang.org/cl/3979045

R=golang-dev
CC=golang-dev
https://golang.org/cl/4052046

  * move stack constants from proc.c to runtime.h
  * make memclr take uintptr length

R=r
CC=golang-dev
https://golang.org/cl/3985046

The implementation of the position computation
was surprisingly broken. Implemented fixes and
added extra test cases.

There is a slight interface change: Calling
Pos() returns the current position; but if
called before Scan() that position may not
be the position of the next token returned
by Scan() (depending on the scan settings
and the source text) - this in contrast to
the original comment.

However, after calling Scan(), the Scanner's
Position field reports the position of the
scanned token, as before.

Fixes #1327.

R=rsc
CC=golang-dev
https://golang.org/cl/3972047

Also simplify sleeper algorithm and poll
occasionally so redundant sleeper goroutines
will quit sooner.

R=r, niemeyer, r2
CC=golang-dev
https://golang.org/cl/4063043

R=rsc
CC=golang-dev, golang-dev
https://golang.org/cl/3992047

R=rsc
CC=golang-dev
https://golang.org/cl/3987045

R=bradfitzgo, r, bradfitzwork, nsz, rsc
CC=golang-dev
https://golang.org/cl/3990043

The docstring claims the function uses PSS message encoding,
when the function actually implements PKCS1-v1_5 encoding.

R=agl1, rsc
CC=danderson, golang-dev
https://golang.org/cl/4097042

R=agl1, danderson
CC=golang-dev
https://golang.org/cl/4029044