fix darwin interrupt bug (race with SIGCHLD).

R=gri
DELTA=46  (40 added, 0 deleted, 6 changed)
OCL=30052
CL=30057

R=rsc
DELTA=31  (6 added, 8 deleted, 17 changed)
OCL=30046
CL=30051

R=rsc
APPROVED=rsc
DELTA=2  (1 added, 0 deleted, 1 changed)
OCL=30043
CL=30043

hand-edited files.

R=r
DELTA=125  (77 added, 16 deleted, 32 changed)
OCL=30001
CL=30008

only automatic g4 mv here.

R=r
OCL=30002
CL=30007

R=dsymonds
DELTA=559  (559 added, 0 deleted, 0 changed)
OCL=29993
CL=30005

R=dsymonds
DELTA=858  (858 added, 0 deleted, 0 changed)
OCL=29992
CL=30004

to expose new CloseWithError methods.

R=r
DELTA=161  (72 added, 15 deleted, 74 changed)
OCL=29980
CL=30003

needs cleanup, optimizer,
but all.bash works.

R=ken
OCL=29974
CL=30000

R=ken
OCL=29989
CL=29999

instead of having to double the type and statement grammars.

R=ken
OCL=29987
CL=29998

R=ken
OCL=29984
CL=29997

TBR=r
OCL=29991
CL=29994

R=rsc
APPROVED=rsc
DELTA=45  (37 added, 1 deleted, 7 changed)
OCL=29964
CL=29990

R=r
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=29986
CL=29988

  * no longer distinguishes const, var, type, package names.
  * all the predefined names are not tokens anymore.

R=ken
OCL=29326
CL=29985

R=gri
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=29971
CL=29975

R=rsc
DELTA=1  (1 added, 0 deleted, 0 changed)
OCL=29970
CL=29973

R=ken
OCL=29972
CL=29972

TBR=rsc
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=29969
CL=29969

(on plan 9 cc calls it log2, but that conflicts here.)
the difference is that xlog2 returns -1 on non powers of 2.
8c was rewriting /10 into /8.

R=ken
OCL=29968
CL=29968

 * use new Make.$GOARCH files in gobuild.
 * rename 6ar to arch-generic gopack.
 * place objects in $GOROOT/pkg/$GOOS_$GOARCH
   (makes cross-compiling easier, and no one
   ever types these paths by hand anyway).

R=r
DELTA=29  (6 added, 8 deleted, 15 changed)
OCL=29923
CL=29967

R=r
DELTA=761  (1 added, 433 deleted, 327 changed)
OCL=29927
CL=29966

- don't show p4 sync output if -verbose is not set

R=rsc
DELTA=25  (5 added, 15 deleted, 5 changed)
OCL=29962
CL=29962

R=rsc
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=29961
CL=29961

- set "Updated" timestamp on served pages to p4 sync time

R=rsc
DELTA=72  (66 added, 3 deleted, 3 changed)
OCL=29959
CL=29959

APPROVED=rsc
DELTA=110  (110 added, 0 deleted, 0 changed)
OCL=29766
CL=29951

remove a few hardcoded paths elsewhere too.

R=r,gri
DELTA=123  (44 added, 15 deleted, 64 changed)
OCL=29914
CL=29945

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