Every time we enter callback from Windows, it is
possible that go exception handler is not at the top
of per-thread exception handlers chain. So it needs
to be installed again. At this moment this is done
by replacing top SEH frame with SEH frame as at time
of syscall for the time of callback. This is incorrect,
because, if exception strike, we won't be able to call
any exception handlers installed inside syscall,
because they are not in the chain. This changes
procedure to add new SEH frame on top of existing
chain instead.

I also removed m sehframe field, because I don't
think it is needed. We use single global exception
handler everywhere.

R=golang-dev, r
CC=golang-dev, hectorchu
https://golang.org/cl/4832060

R=r
CC=golang-dev
https://golang.org/cl/4808088

R=r
CC=golang-dev
https://golang.org/cl/4830069

See https://golang.org/cl/4815087

R=golang-dev, nigeltao
CC=golang-dev
https://golang.org/cl/4849050

The additional token_test.go cases matches html5lib behavior.

Fixes #2124.

R=gri
CC=golang-dev
https://golang.org/cl/4844055

Fixes #2139.

R=golang-dev, alex.brainman
CC=golang-dev
https://golang.org/cl/4838056

This addresses the biggest DoS in issue 2093

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4841050

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/4798071

Also allow struct values as "with" targets.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4809086

It means keeping two sets of maps, but things look cleaner from
the outside.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4839056

Mostly a mechanical change, with a few cleanups to make the split easier.
The external interface to exp/template is unaffected.

In another round I will play with the function map setup to see if I can
avoid exposing reflect across the boundary, but that will require some
structural changes I did not want to mix into this CL.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4849049

Changed some []interface{} uses to slices of the concrete types; removed use of IntVector.

R=gri, rsc
CC=golang-dev
https://golang.org/cl/4810085

- added corresponding test cases
- re-grouped tests for better readability

Fixes #2138.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4815091

container/vector: removed last instances of vector outside of container/vector itself from the core libs

R=gri
CC=golang-dev
https://golang.org/cl/4810078

The mmap system call varies across BSDs. Move mmap and munmap into
the operating system dependent files. This will be needed to add
syscall support for OpenBSD.

R=rsc
CC=golang-dev
https://golang.org/cl/4822056

R=rsc
CC=golang-dev
https://golang.org/cl/4816060

Add support for the go runtime on openbsd/amd64. This is based on
the existing freebsd runtime.

Threads are implemented using OpenBSD's rthreads, which are currently
disabled by default, however can be enabled via the kern.rthreads
sysctl.

For now, cgo is disabled.

R=rsc
CC=golang-dev
https://golang.org/cl/4815067

R=rsc
CC=golang-dev
https://golang.org/cl/4798061

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4855045

The change adds specialized type algorithms
for slices and types of size 8/16/32/64/128.
It significantly accelerates chan and map operations
for most builtin types as well as user structs.

benchmark                   old,ns/op   new,ns/op
BenchmarkChanUncontended          226          94
(on Intel Xeon E5620, 2.4GHz, Linux 64 bit)

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4815087

R=r
CC=golang-dev
https://golang.org/cl/4837063

R=r
CC=golang-dev
https://golang.org/cl/4839052

R=golang-dev, rogpeppe, r, dsymonds, bradfitz, fvbommel
CC=golang-dev
https://golang.org/cl/4830065

R=r, rsc
CC=golang-dev
https://golang.org/cl/4832055

Fixes #1935.

R=rsc, bradfitz
CC=golang-dev
https://golang.org/cl/4850044

Expand the conversations about pointers, memory, and
garbage collection.
Describe the lack of co/contravariant typing.

Fixes #1929.
Fixes #1930.

R=dsymonds, r, mirtchovski, edsrzf, hanwen, rsc
CC=golang-dev
https://golang.org/cl/4852041

R=golang-dev, mattn.jp, dsymonds
CC=golang-dev
https://golang.org/cl/4849042

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4830061

R=golang-dev, dsymonds, bradfitz, kevlar, rsc, r
CC=golang-dev
https://golang.org/cl/4851041

Also sort SRV records before returning from LookupSRV.

R=rsc
CC=golang-dev
https://golang.org/cl/4817049

Fixes #2130.

R=rsc, dave
CC=golang-dev
https://golang.org/cl/4846044

R=golang-dev, bradfitz, rsc
CC=golang-dev
https://golang.org/cl/4838050

R=r, bsiegert, r, alex.brainman
CC=golang-dev
https://golang.org/cl/4662080

The change removes chan finalizer (Lock destructor)
if it is not required on the platform.

benchmark                    old ns/op    new ns/op    delta
BenchmarkChanCreation          1132.00       381.00  -66.34%
BenchmarkChanCreation-2        1215.00       243.00  -80.00%
BenchmarkChanCreation-4        1084.00       186.00  -82.84%
BenchmarkChanCreation-8        1415.00       154.00  -89.12%
BenchmarkChanCreation-16       1386.00       144.00  -89.61%
(on 2 x Intel Xeon E5620, 8 HT cores, 2.4 GHz, Linux)

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4841041

calling filepath.FromSlash(x) make invalid character to serve file.
Fixes #2128

R=golang-dev, alex.brainman, rsc
CC=golang-dev
https://golang.org/cl/4810064

R=rsc
CC=golang-dev
https://golang.org/cl/4808056

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4830059

R=r
CC=golang-dev
https://golang.org/cl/4806049

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4808071

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4801076