This mostly adds Expect 100-continue tests (from
the perspective of server correctness) that were
missing before.

It also fixes a few missing cases that will
probably never come up in practice, but it's nice
to have handled correctly.

Proper 100-continue client support remains a TODO.

R=rsc, bradfitzwork
CC=golang-dev
https://golang.org/cl/4399044

- replaced existing testdata/test.sh with new gofmt_test
- added initial test case for rewrite tests

TODO: Need to add more tests.

R=rsc
CC=golang-dev
https://golang.org/cl/4368063

R=rsc
CC=golang-dev
https://golang.org/cl/4397046

This CL is only cut-and-paste, moving code around.
Moving it in a separate CL should simplify the diffs in later CLs.

There are three patterns here.

1. A function like
        func (v Value) M() (...) {
                return v.panicIfNot(K).(*kValue).M()
        }
becomes
        func (v Value) M() (...) {
                vv := v.panicIfNot(K).(*kValue)

                // body of (*kValue).M, s/v./vv./g
        }

2. A function like
        func (v Value) M() (...) {
                return v.panicIfNots(kList).(mer).M()
        }
becomes
        func (v Value) M() (...) {
                switch vv := v.panicIfNots(kList).(type) {
                case *k1Value:
                        // body of (*k1Value).M, s/v./vv./g
                case *k2Value:
                        // body of (*k2Value).M, s/v./vv./g
                ...
                }
                panic("not reached")
        }

3. The rewrite of Value.Set follows 2, but each case
is built from the bodies of (*kValue).SetValue and (*kValue).Set.
        func (v *kValue) SetValue(x Value) {
                v.Set(x.panicIfNot(K).(*kValue)
        }
        func (v *kValue) Set(x *kValue) {
                ... body
        }
becomes, in the switch from 2,
                case *kValue:
                        xx := x.panicIfNot(K).(*kValue)
                        ... body, s/v./vv./g; s/x./xx./g

R=r
CC=golang-dev
https://golang.org/cl/4398044

R=rsc, gri
CC=golang-dev
https://golang.org/cl/4411044

TBR=r
CC=golang-dev
https://golang.org/cl/4396045

This CL changes the behavior of 'make install' and 'make test'
in the src/cmd directory and the src/pkg directory to have
each recursive make clean up after itself immediately.

It does the same in test/run, removing $F.$A and $A.out
(the common byproducts) between runs.

On machines with slow disks and aggressive kernel caching,
cleaning up immediately can mean that the intermediate
objects never get written to disk.

This change eliminates almost all the disk waiting during
all.bash on my laptop (a Thinkpad X201s with an SSD running Linux).

147.50u 19.95s 277.34r	before
148.53u 21.64s 179.59r	after

R=golang-dev, r, iant2
CC=golang-dev
https://golang.org/cl/4413042

Better to fix the warnings that we find.

R=iant
CC=golang-dev
https://golang.org/cl/4406042

R=golang-dev, r, iant2
CC=golang-dev
https://golang.org/cl/4408043

It matches encoding/line exactly and the tests are copied from there.
If we land this, then encoding/line will get marked as deprecated then
deleted in time.

R=rsc, rog, peterGo
CC=golang-dev
https://golang.org/cl/4389046

R=r, mkrautz, r2, rsc
CC=golang-dev
https://golang.org/cl/4415041

With the (partial) resolution of identifiers done
by the go/parser, ast.Objects point may introduce
cycles in the AST. Don't follow *ast.Objects, and
replace them with nil instead (they are likely
incorrect after a rewrite anyway).

- minor manual cleanups after reflect change automatic rewrite
- includes fix by rsc related to reflect change

Fixes #1667.

R=rsc
CC=golang-dev
https://golang.org/cl/4387044

- fixed a couple of comments
- cleanups after reflect change

R=rsc
CC=golang-dev
https://golang.org/cl/4389041

R=rsc
CC=golang-dev
https://golang.org/cl/4312051

Fmt command filters the current Go buffer through gofmt.
It tries to preserve cursor position and avoids replacing
the buffer with stderr output.

R=golang-dev, dsymonds, niemeyer
CC=golang-dev
https://golang.org/cl/4382053

Fixes #1677.

R=r
CC=golang-dev
https://golang.org/cl/4402042

The changes were not tested for real in an App Engine environment,
so extra care should be taken.  That said, some static testing
was done with pyflakes, and a few existent problems were fixed on
the way.

R=adg
CC=golang-dev
https://golang.org/cl/4378053

'TestReaddir.*' tests now passes.

R=golang-dev, lucio, r
CC=golang-dev
https://golang.org/cl/4381048

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4390047

Suggested by jan.mercl@nic.cz.

R=rsc, jnml
CC=golang-dev
https://golang.org/cl/4376054

Added "void" inside "()" for two functions.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4381056

I entered only one of his several addresses, the one that recent CLs use.

R=rsc, lucio
CC=golang-dev
https://golang.org/cl/4368078

R=adg, rsc, bradfitzwork
CC=golang-dev
https://golang.org/cl/4389048

R=golang-dev, agl1, jnml
CC=golang-dev
https://golang.org/cl/4381058

R=r, rsc, nigeltao_gnome
CC=golang-dev, raph
https://golang.org/cl/4374043

R=rsc
CC=golang-dev
https://golang.org/cl/4381050

Moved Sym printing to Yconv.
Fixed warning in data.c

R=rsc
CC=golang-dev
https://golang.org/cl/4378052

R=golang-dev, bradfitzgo
CC=golang-dev
https://golang.org/cl/4370053

This makes os_test.TestStartProcess test from os package pass.

R=paulzhol, r2, r
CC=golang-dev
https://golang.org/cl/4385052

R=agl1
CC=golang-dev
https://golang.org/cl/4376049

Fixes #1683

R=agl1
CC=golang-dev, rsc
https://golang.org/cl/4367049

R=agl1
CC=golang-dev
https://golang.org/cl/4367051

Fixes #1649.

R=rsc, adg
CC=golang-dev
https://golang.org/cl/4343056

R=adg
CC=golang-dev
https://golang.org/cl/4385051

Fixes #1678.

R=adg, rsc
CC=golang-dev
https://golang.org/cl/4372047

The ld time was dominated by symbol table processing, so
  * increase hash table size
  * emit fewer symbols in gc (just 1 per string, 1 per type)
  * add read-only lookup to avoid creating spurious symbols
  * add linked list to speed whole-table traversals

Breaks dwarf generator (no idea why), so disable dwarf.

Reduces time for 6l to link godoc by 25%.

R=ken2
CC=golang-dev
https://golang.org/cl/4383047

Note that declarations.golden is not using spaces for alignment (so
that the alignment tabs are visible) which is why this change affects
the test cases significantly. gofmt uses spaces for alignment (by default)
and only tabs for indentation.

gofmt -w src misc (no changes)

Fixes #1673.

R=iant
CC=golang-dev
https://golang.org/cl/4388044

"%#v" of a structure with *big.Int's tends to crash a lot otherwise.

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/4382044

Rewrite MOVB with less expensive
instruction when possible.

Suggested by atomic symbol.

benchmark                                        old ns/op    new ns/op    delta
crc32.BenchmarkCrc32KB                               13066         3942  -69.83%
crc64.BenchmarkCrc64KB                                8780         5949  -32.24%
lzw.BenchmarkDecoder1e4                             771224       636538  -17.46%
lzw.BenchmarkDecoder1e5                            7101218      6096634  -14.15%
lzw.BenchmarkDecoder1e6                           69762020     60789400  -12.86%
lzw.BenchmarkEncoder1e4                             707968       638812   -9.77%
lzw.BenchmarkEncoder1e5                            6567122      5965552   -9.16%
lzw.BenchmarkEncoder1e6                           65006000     58911680   -9.38%
utf8_test.BenchmarkRuneCountTenASCIIChars              166          165   -0.60%
utf8_test.BenchmarkRuneCountTenJapaneseChars           246          258   +4.88%
utf8_test.BenchmarkEncodeASCIIRune                      13           10  -23.08%
utf8_test.BenchmarkEncodeJapaneseRune                   37           16  -56.76%
utf8_test.BenchmarkDecodeASCIIRune                      23           21   -8.70%
utf8_test.BenchmarkDecodeJapaneseRune                   58           32  -44.83%

R=ken2
CC=golang-dev
https://golang.org/cl/4381045

Fixes #1670.

R=ken2
CC=golang-dev
https://golang.org/cl/4386045