This is (indirectly) a language change. Per e-mail discussion
on golang-dev.

Fixes #1943.

R=rsc, iant, r, ken
CC=golang-dev
https://golang.org/cl/4581058

If we fail due to a missing command (always bison)
during the build, it is running many things in parallel
and the error message gets lost in the noise.
Also diagnose bison++.

$ ./make.bash
Your system's bison is bison++, a buggy copy of the original bison.
Go needs the original bison instead.
See http://golang.org/doc/install.html#ctools
$ sudo apt-get remove bison++
... ridiculous amount of output ...
$ ./make.bash
Cannot find 'bison' on search path.
See http://golang.org/doc/install.html#ctools
$ sudo apt-get install bison
... ridiculous amount of output ...
$ ./make.bash
... works

Fixes #1938.
Fixes #1946.

R=bradfitz
CC=golang-dev
https://golang.org/cl/4528137

That gcc does not include enumerator names and values
in its DWARF debug output.  Create a data block from which
we can read the values instead.

Fixes #1881.

R=iant
CC=golang-dev
https://golang.org/cl/4607045

R=bradfitz
CC=golang-dev
https://golang.org/cl/4572059

Makes it possible for older tools like objdump to find the filenames,
fixes  objdump -d -l --start-address=0x400c00 --stop-address=0x400c36 6.out
fixes #1950

R=rsc
CC=golang-dev
https://golang.org/cl/4609043

Parser is a work in progress but can populate most of the
interesting parts of the data structure, so a good checkpoint.
All the complicated Perl syntax is missing, as are various
important optimizations made during parsing to the
syntax tree.

The plan is that exp/regexp's API will mimic regexp,
and exp/regexp/syntax provides the parser directly
for programs that need it (and for implementing exp/regexp).

Once finished, exp/regexp will replace regexp.

R=r, sam.thorogood, kevlar, edsrzf
CC=golang-dev
https://golang.org/cl/4538123

Fixes #1952.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4611041

An unusual design using slice and a goroutine makes for a
compact scanner with very little allocation.

R=rsc, r
CC=golang-dev, kevlar
https://golang.org/cl/4610041

R=rsc
CC=golang-dev
https://golang.org/cl/4603043

Fixes #1936.
Fixes #1940.

R=rsc, r, iant, ken, iant
CC=golang-dev
https://golang.org/cl/4585049

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/4605044

implement using TransmitFile().

R=bsiegert, bradfitz, alex.brainman, rsc, go.peter.90
CC=golang-dev
https://golang.org/cl/4536076

R=r, bradfitz, rsc
CC=golang-dev
https://golang.org/cl/4572049

R=r, r
CC=golang-dev
https://golang.org/cl/4592052

%+q uses strconv.Quote[Rune]ToASCII, guaranteeing ASCII-only output.
%#U a quoted character if the rune is printable: 'x'=U+0078; otherwise
it's as before: U+000A.

R=golang-dev, gri, rsc
CC=golang-dev
https://golang.org/cl/4589047

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/4602054

Fixes #1941.

R=rsc
CC=golang-dev
https://golang.org/cl/4576053

R=agl
CC=golang-dev
https://golang.org/cl/4572057

R=bradfitz, r
CC=golang-dev
https://golang.org/cl/4581051

It comes up often enough that it's time to provide
the utility of a standard package.

R=r, mirtchovski, adg, rsc, n13m3y3r, ality, go.peter.90, lstoakes, iant, jan.mercl, bsiegert, robert.hencke, rogpeppe, befelemepeseveze, kevlar
CC=golang-dev
https://golang.org/cl/4557047

R=rsc, r
CC=golang-dev
https://golang.org/cl/4589042

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/4605041

R=r
CC=golang-dev
https://golang.org/cl/4591064

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4601052

R=r
CC=golang-dev
https://golang.org/cl/4589045

R=r, rsc
CC=golang-dev
https://golang.org/cl/4571059

R=iant, rsc
CC=golang-dev
https://golang.org/cl/4601051

With the ReadFrom change in the sendfile CL, it became
possible to illegally send a response to a HEAD request if you
did it via io.Copy.

Fixes #1939

R=rsc
CC=golang-dev
https://golang.org/cl/4584049

gcc-4.6 considers mktemp to be racey

R=golang-dev, rsc, iant
CC=golang-dev
https://golang.org/cl/4602050

R=rsc, r, bradfitz
CC=golang-dev
https://golang.org/cl/4590047

Need to load math.a so that sqrtGoC is available.
Also was missing prototype.

R=ken2
CC=golang-dev
https://golang.org/cl/4517148

R=lvd
CC=golang-dev
https://golang.org/cl/4591063

R=rsc
CC=golang-dev
https://golang.org/cl/4604041

Thumb code and ARM pre-V4 code is unused,
unmaintained, and almost certainly wrong by now.
Every time I try to change 5l I have to sort out
what's dead code and what's not.

30% of lines of code in this directory deleted.

R=ken2
CC=golang-dev
https://golang.org/cl/4601049

After allocparams and walk, remove unused auto variables
and re-layout the remaining in reverse alignment order.

R=rsc
CC=golang-dev
https://golang.org/cl/4568068

5a: add SQRTF and SQRTD
5l: add ASQRTF and ASQRTD

Use ARMv7 VFP VSQRT instruction to speed up math.Sqrt

R=rsc, dave, m
CC=golang-dev
https://golang.org/cl/4551082

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/4591059

check memory overlap

R=rsc, r, ken, edsrzf
CC=golang-dev
https://golang.org/cl/4602047

R=ken2
CC=golang-dev
https://golang.org/cl/4572052

Formality rejected.

R=jeff
CC=golang-dev
https://golang.org/cl/4591057