internal/syscall: add support for getrandom on arm

Added in linux commit eb6452537b28

LGTM=agl
R=agl
CC=golang-codereviews
https://codereview.appspot.com/130170043
runtime: add more cases to GC info test

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews, khr, rlh, rsc
https://codereview.appspot.com/125420043
unicode: strconv: regexp: Upgrade to Unicode 7.0.0.

LGTM=r, bradfitz
R=r, bradfitz
CC=golang-codereviews
https://codereview.appspot.com/127470043
runtime: move panicindex/panicslice to Go.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://codereview.appspot.com/130210043
bzip2: improve performance

Improve performance of move-to-front by using cache-friendly
copies instead of doubly-linked list. Simplify so that the
underlying slice is the object. Remove the n=0 special case,
      which was actually slower with the copy approach.

benchmark                 old ns/op     new ns/op     delta
BenchmarkDecodeDigits     26429714      23859699      -9.72%
BenchmarkDecodeTwain      76684510      67591946      -11.86%

benchmark                 old MB/s     new MB/s     speedup
BenchmarkDecodeDigits     1.63         1.81         1.11x
BenchmarkDecodeTwain      1.63         1.85         1.13x

Updates issue 6754.

LGTM=adg, agl, josharian
R=adg, agl, josharian
CC=golang-codereviews
https://codereview.appspot.com/131840043

Committer: Adam Langley <agl@golang.org>
fmt: print byte stringers correctly

type T byte
func (T) String() string { return "X" }

fmt.Sprintf("%s", []T{97, 98, 99, 100}) == "abcd"
fmt.Sprintf("%x", []T{97, 98, 99, 100}) == "61626364"
fmt.Sprintf("%v", []T{97, 98, 99, 100}) == "[X X X X]"

This change makes the last case print correctly.
Before, it would have been "[97 98 99 100]".

Fixes issue 8360.

LGTM=r
R=r, dan.kortschak
CC=golang-codereviews
https://codereview.appspot.com/129330043
cmd/6g: fix undefined behavior in reg.c

Update issue 8527

Fixes, cmd/6g/reg.c:847:24: runtime error: left shift of 1 by 31 places cannot be represented in type 'int'

LGTM=minux, rsc
R=minux, rsc
CC=dvyukov, golang-codereviews
https://codereview.appspot.com/129290043
runtime: avoid $sym(SB) as constant

The change to pc-relative addressing will make this illegal.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews, r
https://codereview.appspot.com/129890043
liblink: use pc-relative addressing for all memory references in amd64 code

LGTM=rminnich, iant
R=golang-codereviews, rminnich, iant
CC=golang-codereviews, r
https://codereview.appspot.com/125140043
doc/go1.4: mention pc-relative addressing on amd64

CC=golang-codereviews
https://codereview.appspot.com/124580043
cmd/gc, runtime: refactor interface inlining decision into compiler

We need to change the interface value representation for
concurrent garbage collection, so that there is no ambiguity
about whether the data word holds a pointer or scalar.

This CL does NOT make any representation changes.

Instead, it removes representation assumptions from
various pieces of code throughout the tree.
The isdirectiface function in cmd/gc/subr.c is now
the only place that decides that policy.
The policy propagates out from there in the reflect
metadata, as a new flag in the internal kind value.

A follow-up CL will change the representation by
changing the isdirectiface function. If that CL causes
problems, it will be easy to roll back.

Update issue 8405.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews, r
https://codereview.appspot.com/129090043
liblink: fix encoding of ASETPC in 6a, 8a

It was incorrectly encoded as ASETLS.

LGTM=ruiu, rsc
R=rsc, ruiu
CC=golang-codereviews
https://codereview.appspot.com/126400043
runtime: fix windows/amd64 build after pc-relative 6l change

TBR=iant
CC=golang-codereviews
https://codereview.appspot.com/131900043
net/http: correct error message for incorrect Body length

Fixes issue 8140.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://codereview.appspot.com/131900044

Committer: Brad Fitzpatrick <bradfitz@golang.org>
html/template: don't panic on second execution of unescapable template

Fixes issue 8431.

LGTM=r
R=golang-codereviews, r, minux
CC=golang-codereviews
https://codereview.appspot.com/130830043
runtime: apply KindMask before comparison

Fixes windows build.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://codereview.appspot.com/127510043
os: make SameFile handle paths like c:a.txt properly

Fixes issue 8490.

LGTM=r, rsc
R=golang-codereviews, rsc, bradfitz, r
CC=golang-codereviews
https://codereview.appspot.com/127740043