This CL makes resolveInternetAddr return a list of addresses that
contain a pair of different address family IP addresses if possible,
but doesn't contain any API behavioral changes yet. A simple IP
address selection mechanism for Resolve{TCP,UDP,IP}Addr and Dial API
still prefers IPv4.

This is in preparation for TCP connection setup with fast failover on
dual IP stack node as described in RFC 6555.

Update #3610
Update #5267

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13374043

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/13316044

compress/flate is https://golang.org/cl/12953048
compress/zlib is https://golang.org/cl/13171046

Update #6138

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/13435043

Update #4805

Add the ability to set an open connection limit.
Fixed case where the Conn finalCloser was being called with db.mu locked.
Added separate benchmarks for each path for Exec and Query.
Replaced slice based idle pool with list based idle pool.

R=bradfitz
CC=golang-dev
https://golang.org/cl/10726044

This change allows people who want to parse or set odd X.509 extensions
to do so without having to add support for them all to the package.

I tried to make it so that only a single member: Extensions would be
needed. However, that would mean detecting when the caller had altered
the contents of it so that parsing and marshaling a certificate
wouldn't ignore all changes to the other members. This ended up being
messy, thus the current design where there are two members: one for
reading and another for writing.

As crypto/x509 adds support for more extensions in the future, the raw
extensions will still be in Extensions for older code that expects it
there. Also, future extensions will be overridden by any raw extensions
added to ExtraExtensions by code that was written before support was
added.

R=golang-dev, r
CC=golang-dev, jpsugar
https://golang.org/cl/12056043

Also introduce BGET2/4, BPUT2/4 as they are widely used.
Slightly improve BGETC/BPUTC implementation.
This gives ~5% CPU time improvement on go install -a -p1 std.
Before:
real		user		sys
0m23.561s	0m16.625s	0m5.848s
0m23.766s	0m16.624s	0m5.846s
0m23.742s	0m16.621s	0m5.868s
after:
0m22.999s	0m15.841s	0m5.889s
0m22.845s	0m15.808s	0m5.850s
0m22.889s	0m15.832s	0m5.848s

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/12745047

include the new image/color/palette package.

R=r
CC=golang-dev
https://golang.org/cl/13314044

image/color package into their own package. They require some non-
trivial init-time code (interface conversions, currently 40KiB of text)
that would otherwise burden any Go program that imported image/color.

R=r
CC=golang-dev
https://golang.org/cl/13256046

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13324046

This CL adds a new type addrList that will carry a short list of IP
addresses to dial helper functions in the upcoming CLs.

This is in preparation for TCP connection setup with fast failover on
dual IP stack node as described in RFC 6555.

Update #3610
Update #5267

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13241046

Breaks build, and has a race.

««« original CL description
database/sql: add SetMaxOpenConns

Update #4805

Add the ability to set an open connection limit.
Fixed case where the Conn finalCloser was being called with db.mu locked.
Added seperate benchmarks for each path for Exec and Query.
Replaced slice based idle pool with list based idle pool.

R=bradfitz
CC=golang-dev
https://golang.org/cl/10726044

»»»

R=golang-dev
CC=golang-dev
https://golang.org/cl/13252046

Update #4805

Add the ability to set an open connection limit.
Fixed case where the Conn finalCloser was being called with db.mu locked.
Added seperate benchmarks for each path for Exec and Query.
Replaced slice based idle pool with list based idle pool.

R=bradfitz
CC=golang-dev
https://golang.org/cl/10726044

Generated by addca.

R=gobot
CC=golang-dev
https://golang.org/cl/13416043

Fixes #6132.

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/12858049

This CL adds the netaddr interface that will carry a single network
endpoint address or a short list of IP addresses to dial helper
functions in the upcoming CLs.

This is in preparation for TCP connection setup with fast failover on
dual IP stack node as described in RFC 6555.

Update #3610
Update #5267

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13368044

Use either LWP::UserAgent or curl to make HTTP requests so it
works on Windows (most Perl distros include LWP::UserAgent),
and also on OS X (whose Perl at least sometimes doesn't
include LWP::UserAgent).

Fixes #6273

R=golang-dev, alex.brainman, cldorian
CC=golang-dev
https://golang.org/cl/13330044

This replaces the mcall frame with the badmcall frame instead of
leaving the mcall frame on the stack and adding the badmcall frame.
Because mcall is no longer on the stack, traceback will now report what
called mcall, which is what we would like to see in this situation.

R=golang-dev, cshapiro
CC=golang-dev
https://golang.org/cl/13012044

Minor. Saw this in a profile at few percent of CPU and was
curious what it was. Improves overall regexp benchmarks
anywhere from 0 to 3%, but they're a pain to run. You need to
run them in isolation for long runs to get stable numbers.

benchmark                  old ns/op    new ns/op    delta
BenchmarkEmptyOpContext          537          473  -11.92%

R=golang-dev, crawshaw
CC=golang-dev
https://golang.org/cl/13407043

AES-GCM is the only current TLS ciphersuite that doesn't have
cryptographic weaknesses (RC4), nor major construction issues (CBC mode
ciphers) and has some deployment (i.e. not-CCM).

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13249044

I noticed that this one benchmark in particular was very
noisy.  Looking into it, I saw that the table was wrong
and inconsistent with the lines above and below.

R=golang-dev, crawshaw
CC=golang-dev
https://golang.org/cl/13393045

R=bradfitz, alberto.garcia.hierro, rsc, adg
CC=golang-dev
https://golang.org/cl/7099045

When searching for an allocated bit, flushptrbuf would search
backward in the bitmap word containing the bit of pointer
being looked-up before searching the span.  This extra check
was not replicated in markonly which, instead, after not
finding an allocated bit for a pointer would directly look in
the span.

Using statistics generated from godoc, before this change span
lookups were, on average, more common than word lookups.  It
was common for markonly to consult spans for one third of its
pointer lookups.  With this change in place, what were
previously span lookups are overwhelmingly become by the word
lookups making the total number of span lookups a relatively
small fraction of the whole.

This change also introduces some statistics gathering about
lookups guarded by the CollectStats enum.

R=golang-dev, khr
CC=golang-dev
https://golang.org/cl/13311043

#pragma textflag and #pragma dataflag directives.
Update dataflag directives to use symbols instead of integer constants.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13310043

Fixes #6138.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/12953048

Fixes #5378

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/13247044

Types in function scope can have methods on them if they embed another type, but we didn't make the name unique, meaning that 2 identically named types in different functions would conflict with eachother.

Fixes #6269.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13326045

These instructions are emitted when GO386=387 or the target
i386 CPU does not have SSE2 capabilities.

Fixes #6215.

R=golang-dev, remyoudompheng
CC=golang-dev
https://golang.org/cl/12812045

The compiler computes initialization order by finding
a spanning tree between a package's global variables.
But it does so by walking both variables and functions
and stops detecting cycles between variables when they
mix with a cycle of mutually recursive functions.

Fixes #4847.

R=golang-dev, daniel.morsing, rsc
CC=golang-dev
https://golang.org/cl/9663047

Fixes #6140.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/13083043

Thanks to beatgammit for the fix.

Fixes #5408.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13261048

R=r, dvyukov
CC=golang-dev
https://golang.org/cl/13348045

Accidentally submitted.

««« original CL description
encoding/json: add "overflow" struct tag option

Fixes #6213.

R=golang-dev, dsymonds, bradfitz
CC=golang-dev
https://golang.org/cl/13180043
»»»

R=golang-dev
CC=golang-dev
https://golang.org/cl/13234045

Before this fix, it was always an error to use the Close method on the
io.WriteCloser obtained from Cmd.StdinPipe, as it would race with the
Close performed by Cmd.Wait.

Fixes #6270.

R=golang-dev, r, remyoudompheng, bradfitz, dsymonds
CC=golang-dev
https://golang.org/cl/13329043

Fixes #6213.

R=golang-dev, dsymonds, bradfitz
CC=golang-dev
https://golang.org/cl/13180043

Adapted from https://golang.org/cl/11564044.

Fixes breakage of darwin-amd64-race builder.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/13352045

See how it flies. We'll disable it again if the underlying issue is not resolved.
See issue 4155 for details.

Fixes #4155.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13368045

Update #4856

R=golang-dev, bradfitz, dave
CC=golang-dev
https://golang.org/cl/12916046

Fixes #3944.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/13263043

Causes the package dependencies to include those for race detection.
Fixes #5653.

R=golang-dev, dave, bradfitz
CC=golang-dev
https://golang.org/cl/13236045

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/13334043