Add coverage for some uncovered bytes methods. The increase in actual coverage is disapointing small.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13651044

Fixes #6353.

R=golang-dev, bradfitz, alex.brainman
CC=golang-dev
https://golang.org/cl/13652043

The scan starts at the directory we care about and works
backward to the GOPATH root. The error should say the
original directory name, not the name of the GOPATH root.

Fixes #6175.

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/13366050

Fixes #5764.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13441051

The entry for LEAL/LEAQ in these optabs was listed as having
two data bytes in the y array. In fact they had and expect no data
bytes. However, the general loop expects to be able to look at at
least one data byte, to make sure it is not 0x0f. So give them each
a single data byte set to 0 (not 0x0f).

Since the MOV instructions have the largest optab cases, this
requires growing the size of the data array.

Clang found this bug because the general o->op[z] == 0x0f
test was using z == 22, which was out of bounds.

In practice the next byte in memory was probably not 0x0f
so it wasn't truly broken. But might as well be clean.

Update #5764

R=ken2
CC=golang-dev
https://golang.org/cl/13241050

Fixes cpu subtype check when using external linker which sets the CPU_SUBTYPE_LIB64 bit (1<<31).
Fixes #6197.

R=golang-dev, minux.ma, rsc
CC=golang-dev
https://golang.org/cl/13248046

Generated by addca.

R=gobot
CC=golang-dev
https://golang.org/cl/13265044

For example, if an x_test.go file contains a syntax error,
b.test fails with an error message. But it wasn't printing
the same FAIL line that a build failure later would print.
This makes all the test failures that happen (once we
decide to start running tests) consistently say FAIL.

Fixes #4701.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13431044

A package main binary (that is, a command) being installed
does not mean we can skip the build of the package archive
during a test.

Fixes #3417.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13462046

Fixes #5662.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13650043

It was lost when the generic "Notes" support went in.

Had to change the test setup, because it precluded even
being able test multi-line comments, much less multi-paragraph
comments.

Now 'godoc sync/atomic' works correctly again.

Fixes #6135.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13427045

Fixes #6191.
Fixes #5426.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13234052

Fixes #5054.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/13609043

Remove test of whether SWIG shared library is older than
sources--should be covered by test of package file anyhow.

Fixes #5739.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/13352046

Fixes #5774.

R=golang-dev, adg, r, bradfitz
CC=golang-dev
https://golang.org/cl/9164043

If using other gdb python scripts loaded before Go's gdb-runtime.py
and that have a different init prototype:
Traceback (most recent call last):
  File "/usr/lib/go/src/pkg/runtime/runtime-gdb.py", line 446, in <module>
    k()
TypeError: __init__() takes exactly 3 arguments (1 given)

The problem is that gdb keeps all python scripts in the same namespace,
so vars() contains them. To avoid that, load helpers one by one.

R=iant, rsc
CC=gobot, golang-dev
https://golang.org/cl/9752044

R=golang-dev, bradfitz
CC=ail, golang-dev
https://golang.org/cl/13441050

$INTBITS will not be defined, of course, but that's the best we can do.

Fixes #5978.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/13253048

Fixes #5676.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13250047

Fixes #6038.

R=iant
CC=golang-dev
https://golang.org/cl/13649043

Various compilers complain about the macro expansion not
being used. I fixed a few yesterday. More today.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13643044

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/13336046

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/13396051

R=golang-dev, remyoudompheng, dominik.honnef, adg
CC=golang-dev
https://golang.org/cl/13341049

Fixes #6224

R=golang-dev, hcwfrichter, bradfitz
CC=golang-dev
https://golang.org/cl/13410045

Fixes #4900.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13400044

Before CL 7065067 calling Next on an element returned either the
next/prev element or nil was returned.  After the CL if an element
was not part of a list e.Next() and e.Prev() will panic.  This CL
returns to the documented behavior, that Next/Prev returns the
next/prev list element or nil.

Fixes #6349.

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/13234051

Bug3486 tried to walk the entire file tree, but other tests might
be creating and removing files in that tree. In particular, package os
creates and removes files in the os directory, and issue 5863
reports failures due to seeing those files appear and then disappear.

Change the test to walk just the test tree, which should not be
changing.

Fixes #5863.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13467045

Fixes #6341.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13512048

Fixes #5894.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/13303051

Fixes #5803.
Is it correct behavior? Who knows.

R=golang-dev, bradfitz, jgc
CC=golang-dev, jgc
https://golang.org/cl/13248048

This will bring in the C++ standard library without requiring
any special #cgo LDFLAGS options.

When using gccgo, just add -lstdc++ to link line; this should
do no harm if it is not needed.

No tests, since we don't want to assume a C++ compiler.

Update #5629

R=golang-dev, minux.ma, rsc
CC=golang-dev
https://golang.org/cl/13394045

If you thought gcc -ansi -pedantic was pedantic, just wait
until you meet clang -fsanitize=undefined.

I think this addresses all the reported "errors", but we'll
need another run to be sure.

all.bash still passes.

Update #5764

Dave, can you please try again?

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13334049

The code in question is trying to print a nice error message
when a Go EABI binary runs on an OABI machine.
Unfortunately, the only way to do that is to use
ARM Thumb instructions, which we otherwise don't use.

There exist ARM EABI machines that do not support Thumb.
We could run on them if not for this OABI check, so disable it.

Fixes #5685.

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/13234050

Fixes #6036.

R=golang-dev, bradfitz, rsc
CC=golang-dev
https://golang.org/cl/12992043

Fixes #5578.

R=ken2
CC=golang-dev
https://golang.org/cl/13417044

Fixes #5122.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/13395046

R=ken2
CC=golang-dev
https://golang.org/cl/13512047

Fixes #6004.

R=ken2
CC=golang-dev
https://golang.org/cl/13616044

Cannot happen when using the go command, but help
people running commands by hand or with other tools.

Fixes #5888.

R=ken2
CC=golang-dev
https://golang.org/cl/13324048