Fixes #1742.
I hope.

Also this picks up an update to go_tutorial.html that should already have happened.

R=brainman, rsc, peterGo
CC=golang-dev
https://golang.org/cl/4452050

R=dsymonds
CC=golang-dev
https://golang.org/cl/4436060

Fixes #1531.

R=adg
CC=golang-dev
https://golang.org/cl/4442088

For example, with GOPATH set like so
        GOPATH=/home/adg/gocode
And after creating some subdirectories
        mkdir /home/adg/gocode/{bin,pkg,src}

I can use goinstall to install the github.com/nf/goto web server,
which depends on the github.com/nf/stat package, with
        goinstall github.com/nf/goto

This downloads and installs all dependencies (that aren't already
installed) like so
        /home/adg/gocode/bin/goto
        /home/adg/gocode/pkg/darwin_amd64/github.com/nf/stat.a
        /home/adg/gocode/src/github.com/nf/goto/...
        /home/adg/gocode/src/github.com/nf/stat/...

R=rsc, niemeyer
CC=golang-dev
https://golang.org/cl/4438043

R=rsc, dfc
CC=golang-dev
https://golang.org/cl/4452047

R=bradfitzgo
CC=golang-dev
https://golang.org/cl/4442085

Can make the API nicer in some cases.

R=rsc, rog, r2
CC=golang-dev
https://golang.org/cl/4428064

No bugs found yet, though.

R=rsc, bradfitzwork
CC=golang-dev
https://golang.org/cl/4436058

I ran the new verification code against a large number of certificates
with a huge (>1000) number of intermediates.

I had previously convinced myself that a cycle in the certificate
graph implied a cycle in the hash graph (and thus, a contradiction).
This is bogus because the signatures don't cover each other.

Secondly, I managed to drive the verification into a time explosion
with a fully connected graph of certificates. The code would try to
walk the factorial number of paths.

This change switches the CertPool to dealing with indexes of
certificates rather than pointers: this makes equality easy. (I didn't
want to compare pointers because a reasonable gc could move objects
around over time.)

Secondly, verification now memorizes the chains from a given
certificate. This is dynamic programming for the lazy, but there's a
solid reason behind it: dynamic programming would ignore the Issuer
hints that we can exploit by walking up the chain rather than down.

R=bradfitzgo
CC=golang-dev
https://golang.org/cl/4439070

R=rsc, bradfitzgo
CC=golang-dev
https://golang.org/cl/4433070

Used to fault trying to access l->list->next
when l->list == nil after MCentral_AllocList.
Now prints

runtime: out of memory: no room in arena for 65536-byte allocation (536870912 in use)
throw: out of memory

followed by stack trace.

Fixes #1650.

R=r, dfc
CC=golang-dev
https://golang.org/cl/4446062

R=bradfitzgo, rsc, peterGo
CC=golang-dev
https://golang.org/cl/4441051

This change will allow to generate valid executable,
even if rsc disables dwarf generation, as it happend
at revision 9a64273f9d68.

R=rsc
CC=golang-dev, lvd, vcc
https://golang.org/cl/4425066

Work on issue 155

R=rsc, bradfitzwork
CC=golang-dev
https://golang.org/cl/4435071

Also, 6g was passing uninitialized
Node &n2 to regalloc, causing non-deterministic
register collisions (but only when both left and
right hand side of comparison had function calls).

Fixes #1728.

R=ken2
CC=golang-dev
https://golang.org/cl/4425070

It's no longer used.

R=adg
CC=golang-dev
https://golang.org/cl/4426061

Will fill dashboard down the screen instead of up
when builders get stuck and resume.  Already live.

Also delete dead benchmark code.
I think it is safe to say that if/when we bring
benchmarks back, we will use a different
data model.

Fixes #1228.

R=adg
CC=golang-dev
https://golang.org/cl/4449059

This permits the websocket handler to inspect http headers and such.

Fixes #1726.

R=ukai, bradfitz, bradfitzgo
CC=golang-dev
https://golang.org/cl/4439069

R=rsc, r
CC=golang-dev
https://golang.org/cl/4438069

Fixes #1680.

R=ken2
CC=golang-dev
https://golang.org/cl/4446061

Tested on Linux and OS X, amd64 and 386.

R=r, iant
CC=golang-dev
https://golang.org/cl/4452046

R=rsc
CC=golang-dev
https://golang.org/cl/4440066

R=r
CC=golang-dev
https://golang.org/cl/4430064

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4435067

R=r, bradfitzgo
CC=golang-dev
https://golang.org/cl/4433066

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4450053

$ gcc --version
gcc (GCC) 4.6.0 20110415 (prerelease)

R=golang-dev, rsc1, rsc
CC=golang-dev
https://golang.org/cl/4442080

Fixes #1511.

R=golang-dev, iant2
CC=golang-dev
https://golang.org/cl/4433065

Set mailed bit correctly for self-clpatch.
Use repo.rollback correctly.
Allow leading spaces in some C code.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4438064

Fixes #1705.

R=ken2
CC=golang-dev
https://golang.org/cl/4443060

Fixes #1716.

R=golang-dev, rsc1, rsc
CC=golang-dev
https://golang.org/cl/4439068

The unexported version returns a sensible default when the user hasn't
set a value. The exported version crashes in that case.

R=bradfitzgo, rsc1
CC=golang-dev
https://golang.org/cl/4435070

R=r
CC=golang-dev
https://golang.org/cl/4436053

The path conversion is done automatically if msys' builtin
shell commands are used.

R=rsc1, peterGo, brainman, Mr_Dark, r
CC=golang-dev
https://golang.org/cl/4452042

Fixes #1727.

R=rsc
CC=golang-dev
https://golang.org/cl/4437069

Fixes #1709.

R=ken2
CC=golang-dev
https://golang.org/cl/4438068

Fixes #1712.

R=ken2
CC=golang-dev
https://golang.org/cl/4445055

Fixes #1474.

R=ken2
CC=golang-dev
https://golang.org/cl/4432061

Static symbols were not being marked as such.

I also made the 'z' symbols use the first byte of
the name instead of an explicit NUL so that if
the symbol table format is ever changed, the only
place that would need updating is addhist().

R=rsc
CC=golang-dev
https://golang.org/cl/4366047

TBR=r
CC=golang-dev
https://golang.org/cl/4449051