Fixes #932.

R=rsc
CC=golang-dev
https://golang.org/cl/3515041

- change Walk signature to use an ast.Node instead of interface{}
- add Pos functions to a couple of ast types to make them proper nodes
- explicit nil checks where a node can be nil; incorrect ASTs cause Walk to crash

For now ast.Walk is exercised extensively as part of godoc's indexer;
so we have some confidence in its correctness. But this needs a test,
eventually.

Fixes #1326.

R=rsc, r
CC=golang-dev
https://golang.org/cl/3481043

(inspired by CL 3529041 by hitchmanr@gmail.com)

R=rsc
CC=golang-dev
https://golang.org/cl/3527042

This patch adds a new package: os/inotify, which
provides a Go wrapper to the Linux inotify system.

R=rsc, albert.strasheim, rog, jacek.masiulaniec
CC=golang-dev
https://golang.org/cl/2049043

R=iant, r2
CC=golang-dev
https://golang.org/cl/3532042

At the moment, and for the forseeable future, it only checks arguments to print calls.

R=rsc, gri, niemeyer, iant2, rog, lstoakes, jacek.masiulaniec, cw
CC=golang-dev
https://golang.org/cl/3522041

Fixes #1278.

R=rsc
CC=golang-dev
https://golang.org/cl/3434046

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/3529041

R=rsc
CC=golang-dev
https://golang.org/cl/3524041

R=r
CC=golang-dev
https://golang.org/cl/3516042

R=ken2
CC=golang-dev
https://golang.org/cl/3523041

Necessary but not sufficient step toward
making those builds work.

R=r
CC=golang-dev
https://golang.org/cl/3411043

R=rsc
CC=golang-dev
https://golang.org/cl/3431046

R=ken2
CC=golang-dev
https://golang.org/cl/3521041

Makes 5l build with recent changes, but not yet tested on ARM hardware.

R=ken2
CC=golang-dev
https://golang.org/cl/3449044

        One of my own experiments ended up getting mistakenly commited when
        switching to Jacobian transformations.

R=rsc
CC=golang-dev
https://golang.org/cl/3473044

R=r
CC=golang-dev
https://golang.org/cl/3448043

Move unported files (freebsd*, windows*, nacl*) to runtime/cgo.

Step toward fixing FreeBSD build.

R=r
TBR=r
CC=golang-dev
https://golang.org/cl/3497042

bug introduced at
https://golang.org/cl/2331044

R=ken2
CC=golang-dev
https://golang.org/cl/3440046

This is a second attempt at submitting
https://golang.org/cl/3420043

A Mercurial problem lost the new files
in that submit.

TBR=r
CC=golang-dev
https://golang.org/cl/3511043

Very few changes here: the subtle ones are in Make.pkg.

Note that incredibly (and importantly) there are
no changes necessary to the test programs in misc/cgo.

R=iant
CC=golang-dev
https://golang.org/cl/3504041

More support for references to dynamic symbols,
including full GOT and PLT for ELF objects.

For Mach-O everything ends up in the GOT: dealing
with the real lazy PLT is too hard for now so we punt.

R=iant, iant2
CC=golang-dev
https://golang.org/cl/3491042

Formerly known as libcgo.
Almost no code here is changing; the diffs
are shown relative to the originals in libcgo.

R=r
CC=golang-dev
https://golang.org/cl/3420043

R=iant
CC=golang-dev
https://golang.org/cl/3431045

R=r, iant
CC=golang-dev
https://golang.org/cl/3470044

R=iant
CC=golang-dev
https://golang.org/cl/3503041

R=ken2, ken3
CC=golang-dev
https://golang.org/cl/3505041

R=iant
CC=golang-dev
https://golang.org/cl/3507041

R=iant
CC=golang-dev
https://golang.org/cl/3506041

R=rh, gri
CC=golang-dev
https://golang.org/cl/3514041

The $GOOS choices text and combinations list should match.

R=adg
CC=golang-dev
https://golang.org/cl/3485046

Reduces indexing time by ~10%; from ~44s to ~39s, best of 3 runs.

R=rsc
CC=golang-dev
https://golang.org/cl/3510041

R=rsc
CC=golang-dev
https://golang.org/cl/3399042

Fixes #1270.

R=vcc, rsc
CC=golang-dev
https://golang.org/cl/3299041

R=rsc
CC=golang-dev
https://golang.org/cl/3426042

R=rsc
CC=golang-dev
https://golang.org/cl/3463043

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/3419043

R=rsc
CC=golang-dev
https://golang.org/cl/3508041

R=rsc
CC=golang-dev
https://golang.org/cl/3002041

R=r
CC=golang-dev
https://golang.org/cl/3502041