allocparams + tempname + compactframe
all knew about how to place stack variables.

Now only compactframe, renamed to allocauto,
does the work.  Until the last minute, each PAUTO
variable is in its own space and has xoffset == 0.

This might break 5g.  I get failures in concurrent
code running under qemu and I can't tell whether
it's 5g's fault or qemu's.  We'll see what the real
ARM builders say.

R=ken2
CC=golang-dev
https://golang.org/cl/4973057

Fixes #2129.

R=rsc
CC=golang-dev
https://golang.org/cl/4934049

Fixes #2232.

R=ken2
CC=golang-dev
https://golang.org/cl/4960054

- fixed performance bug that could lead to O(n^2) behavior
- performance improvement for ASCII case

R=r, r
CC=golang-dev
https://golang.org/cl/4956060

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4950064

R=fullung, golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4986041

R=golang-dev, rsc
CC=golang-dev, mike.rosset
https://golang.org/cl/4950062

There was a time (in the past) when this wasn't robust.

R=rsc, dvyukov
CC=golang-dev
https://golang.org/cl/4965058

Fixes #2219.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4950063

R=n13m3y3r
CC=golang-dev
https://golang.org/cl/4918050

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4963059

Fixes #2219.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4960052

There's some ambiguity in the U{url: url} case as it could be
both a map or a struct literal, but given context it's more
likely a struct, so U{url: url_} rather than U{url_: url_}.
At least that was the case for me.

R=golang-dev, rsc, adg
CC=golang-dev
https://golang.org/cl/4972052

Fixes #2194.

R=rsc, alex.brainman, vcc.163, jp
CC=golang-dev
https://golang.org/cl/4977044

R=mikesamuel
CC=golang-dev
https://golang.org/cl/4968063

R=ken2
CC=golang-dev
https://golang.org/cl/4967052

Fixes Han-Wen's termite bug.

R=lvd
CC=golang-dev
https://golang.org/cl/4977052

- read search index files in groutine to avoid
  start-up failure on app engine because reading
  the files takes too long
- permit usage of search index files and indexer
- minor cosmetic cleanups

R=dsymonds
CC=golang-dev
https://golang.org/cl/4952050

Needed to ensure that finding the last boundary does not result in O(n^2)-like behavior.
Now prevents lookbacks beyond 31 characters across the board (starter + 30 non-starters).
composition.go:
- maxCombiningCharacters now means exactly that.
- Bug fix.
- Small performance improvement/ made code consistent with other code.
forminfo.go:
- Bug fix: ccc needs to be 0 for inert runes.
normalize.go:
- A few bug fixes.
- Limit the amount of combining characters considered in FirstBoundary.
- Ditto for LastBoundary.
- Changed semantics of LastBoundary to not consider trailing illegal runes a boundary
  as long as adding bytes might still make them legal.
trie.go:
- As utf8.UTFMax is 4, we should treat UTF-8 encodings of size 5 or greater as illegal.
  This has no impact on the normalization process, but it prevents buffer overflows
  where we expect at most UTFMax bytes.

R=r
CC=golang-dev
https://golang.org/cl/4963041

Interesting that Fprintf can do zero mallocs.
(Sprintf must allocate the returned string.)

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/4977049

No need for lexInsideAction to loop.
Fixes #2217.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/4963054

R=nigeltao
CC=golang-dev
https://golang.org/cl/4962049

Fixes #2185.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4967046

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4985041

Was keeping a pointer to the labeled statement in n->right,
which meant that generic traversals of the tree visited it twice.
That combined with aggressive flattening of the block
structure when possible during parsing meant that
the kinds of label: code label: code label: code sequences
generated by yacc were giving the recursion 2ⁿ paths
through the program.

Fixes #2212.

R=lvd
CC=golang-dev
https://golang.org/cl/4960050

Fixes #2213.

R=rsc
CC=golang-dev
https://golang.org/cl/4975047

R=r
CC=golang-dev
https://golang.org/cl/4968057

When installing profiling tools on Mac OS X print
message if there is a problem with /usr/local/bin

Fixes #2209.

R=golang-dev, r, adg
CC=golang-dev, mike.rosset
https://golang.org/cl/4950057

R=r, adg
CC=golang-dev
https://golang.org/cl/4975046

This transitions into a JS state when entering any attribute whose
name starts with "on".

It does not yet enter a JS on entry into a <script> element as script
element handling is introduced in another CL.

R=nigeltao
CC=golang-dev
https://golang.org/cl/4968052

R=rsc, r
CC=golang-dev
https://golang.org/cl/4977046

changeset: 8812:3fb3e88d5aa8
gc: unsafe.Alignof, unsafe.Offsetof, unsafe.Sizeof now return uintptr

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4951051

R=r
CC=golang-dev
https://golang.org/cl/4973050

- KindRuns don't need to repeat SpotKind,
  it is stored in each Spot
- removed extra indirection from FileRuns
  to KindRuns
- slight reduction of written index size
  (~500KB)

R=rsc
CC=golang-dev
https://golang.org/cl/4969052

Also makes sync benchmark concurrent.

R=r, rsc
CC=golang-dev
https://golang.org/cl/4911043

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4972053

R=golang-dev, n13m3y3r, r
CC=golang-dev
https://golang.org/cl/4958053

Does as much as possible in data layout instead
of during the init function.

Handles var x = y; var y = z as a special case too,
because it is so prevalent in package unicode
(var Greek = _Greek; var _Greek = []...).

Introduces InitPlan description of initialized data
so that it can be traversed multiple times (for example,
in the copy handler).

Cuts package unicode's init function size by 8x.
All that remains there is map initialization, which
is on the chopping block too.

Fixes sinit.go test case.

Aggregate DATA instructions at end of object file.

Checkpoint.  More to come.

R=ken2
CC=golang-dev
https://golang.org/cl/4969051

My string literal was being rewritten from
"runtime.SysReserve(%p, %D) = error %d"
to
"runtime.SysReserve ( %p , %D ) = error %d"

R=iant
CC=golang-dev
https://golang.org/cl/4972051

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4963050