detect 386 darwin breakpoint line.

R=r
DELTA=22  (4 added, 0 deleted, 18 changed)
OCL=29929
CL=29944

R=r
DELTA=13  (0 added, 1 deleted, 12 changed)
OCL=29928
CL=29943

R=rsc
APPROVED=rsc
DELTA=3  (0 added, 0 deleted, 3 changed)
OCL=29532
CL=29917

R=kaib
DELTA=36  (0 added, 36 deleted, 0 changed)
OCL=29908
CL=29916

R=r
DELTA=44  (19 added, 1 deleted, 24 changed)
OCL=29912
CL=29915

R=rsc
DELTA=18  (10 added, 2 deleted, 6 changed)
OCL=29909
CL=29909

R=ken
OCL=29907
CL=29907

- cleanups:
  - replaced internal byte buffer implementation with io.ByteBuffer (now that we have one)
  - removed all uses of goto statements in favor of structured code
  - converted tests into a table-driven test

R=r
DELTA=277  (48 added, 67 deleted, 162 changed)
OCL=29890
CL=29901

add -match flag to select tests.

gotest -match 'TestDeepEqual$'

R=r
DELTA=13  (12 added, 0 deleted, 1 changed)
OCL=29900
CL=29900

R=rsc
DELTA=61  (8 added, 31 deleted, 22 changed)
OCL=29897
CL=29899

likely to go back to registers for most temporaries.

most tests in lib pass.  these fail:

	datafmt
	fmt
	go/scanner
	log
	reflect
	strconv
	template

R=ken
OCL=29896
CL=29898

R=rsc
DELTA=38  (38 added, 0 deleted, 0 changed)
OCL=29895
CL=29895

also has Equal and Compare

R=rsc
DELTA=348  (348 added, 0 deleted, 0 changed)
OCL=29892
CL=29894

- treat '\f' like '\n' ('\f' has special meaning in the
  tabwriter now)

R=rsc
DELTA=7  (4 added, 0 deleted, 3 changed)
OCL=29790
CL=29893

R=r
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=29889
CL=29889

R=r
DELTA=115  (115 added, 0 deleted, 0 changed)
OCL=29884
CL=29888

R=r
DELTA=1652  (1652 added, 0 deleted, 0 changed)
OCL=29883
CL=29887

(stuck on 8l bug).

R=r
DELTA=349  (342 added, 1 deleted, 6 changed)
OCL=29882
CL=29886

R=r
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=29881
CL=29885

can pass many tests;
current stumbling block is an 8l bug.

R=r
DELTA=122  (83 added, 8 deleted, 31 changed)
OCL=29872
CL=29876

R=r
DELTA=25  (25 added, 0 deleted, 0 changed)
OCL=29875
CL=29875

R=r
DELTA=40  (40 added, 0 deleted, 0 changed)
OCL=29850
CL=29855

R=ken
OCL=29849
CL=29849

didn't see this as a diff.

TBR=r
OCL=29827
CL=29831

R=rsc
APPROVED=rsc
DELTA=13  (13 added, 0 deleted, 0 changed)
OCL=29429
CL=29819

R=ken
OCL=29812
CL=29812

  * floating point -> integer conversions.
    x86 defines that overflow/underflow
    results in 1<<15, 1<<31, 1<<63 for
    int16, int32, int64.  when building the
    unsigned conversions out of the native signed
    ones, 8g turns overflow/underflow into zero.
    the spec does not say what should happen.

  * many tiny bug fixes.  can run a large number
    of files from go/test now, and can fmt.Printf.

  * struggling with byte register allocation
    and float32 computation.

R=ken
OCL=29642
CL=29811

R=r
DELTA=1615  (1615 added, 0 deleted, 0 changed)
OCL=29803
CL=29810

R=r
DELTA=161  (153 added, 0 deleted, 8 changed)
OCL=29802
CL=29809

R=ken
OCL=29806
CL=29808

from GOARCH_GOOS -> GOOS_GOARCH.

update os_test and add test of Time.

R=r
DELTA=490  (247 added, 233 deleted, 10 changed)
OCL=29730
CL=29805

avoid tight coupling between deferreturn and jmpdefer.
before, jmpdefer knew the exact frame size of deferreturn
in order to pop it off the stack.  now, deferreturn passes
jmpdefer a pointer to the frame above it explicitly.
that avoids a magic constant and should be less fragile.

R=r
DELTA=32  (6 added, 3 deleted, 23 changed)
OCL=29801
CL=29804

move PtrSize value into 6l/8l files.

R=r
DELTA=78  (47 added, 15 deleted, 16 changed)
OCL=29729
CL=29798

This is imported from //cacheserving/gash/cache/list*.go,
but with style changes to suit the Go standard library.

R=r,rsc
APPROVED=r
DELTA=286  (286 added, 0 deleted, 0 changed)
OCL=29438
CL=29796

convention used in template.go)

R=rsc
DELTA=22  (3 added, 1 deleted, 18 changed)
OCL=29780
CL=29782

R=rsc
DELTA=7  (0 added, 0 deleted, 7 changed)
OCL=29776
CL=29778

- factored out datafmt-specifics from pretty to ast

R=rsc
DELTA=3580  (1810 added, 1763 deleted, 7 changed)
OCL=29770
CL=29774

- Extend http.URLUnescape to convert '+' to space
- Add http.URLEscape
- Rename URL.Query to EncodedQuery (and stop decoding it, as decoding this field
  before separating key/value pairs loses important information)
- Report a clean error on incomplete hex escapes
- Update existing tests, add new ones

APPROVED=rsc
DELTA=293  (256 added, 3 deleted, 34 changed)
OCL=29685
CL=29759

associated with CL 29709.

R=r
DELTA=6444  (3476 added, 2958 deleted, 10 changed)
OCL=29710
CL=29724

auto-generated files and deletions are in another CL.

goals for new syscall:
	* automate as much as possible
	* do not let clients do unsafe things
	* use simple types (int not int64)
	* fewer files

the files are renamed from foo_amd64_linux to foo_linux_amd64,
both because it reads better (all the linux are related, all the amd64 less so)
and because it made it easier to replace the existing ones.

R=r
DELTA=2336  (2260 added, 6 deleted, 70 changed)
OCL=29709
CL=29723