errors introduced in CL 30601

R=austin
DELTA=6  (3 added, 0 deleted, 3 changed)
OCL=30663
CL=30665

do not bother warning about marks left
on stack after syntax errors.

leave OCONV nodes in tree to avoid type errors
arising from multiple walks.

R=ken
OCL=30639
CL=30662

R=rsc
DELTA=7  (5 added, 0 deleted, 2 changed)
OCL=30657
CL=30659

R=rsc
DELTA=9  (0 added, 0 deleted, 9 changed)
OCL=30658
CL=30658

- morestack and gosave/gogo/gocall support
- memclr and memset from inferno
- bugfixes in _rt0_arm

R=rsc
APPROVED=rsc
DELTA=304  (174 added, 36 deleted, 94 changed)
OCL=30636
CL=30642

R=rsc
DELTA=61  (48 added, 0 deleted, 13 changed)
OCL=30616
CL=30619

so implement the check manually.
sigh.

R=r
DELTA=17  (6 added, 0 deleted, 11 changed)
OCL=30606
CL=30612

because Url.Path already starts with one.
Avoid crashing in Request.ParseForm if there is no body.

R=rsc
APPROVED=rsc
DELTA=5  (4 added, 0 deleted, 1 changed)
OCL=30552
CL=30607

R=r
DELTA=7  (6 added, 0 deleted, 1 changed)
OCL=30596
CL=30605

R=rsc
DELTA=6  (1 added, 3 deleted, 2 changed)
OCL=30604
CL=30604

R=rsc
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=30599
CL=30602

R=r
DELTA=19  (3 added, 1 deleted, 15 changed)
OCL=30591
CL=30601

old:
	CONSTANTS
	const (
	    MissingKind = iota;
	  )
new:
	CONSTANTS

	const (
	    MissingKind = iota;
	 )

R=gri,rsc
DELTA=4  (4 added, 0 deleted, 0 changed)
OCL=30362
CL=30598

R=rsc
APPROVED=rsc
DELTA=5  (5 added, 0 deleted, 0 changed)
OCL=30587
CL=30595

in cap, len, [], and range on maps, strings, and slices.

R=r
DELTA=57  (2 added, 12 deleted, 43 changed)
OCL=30549
CL=30590

remove io.ErrEOF.
rename io.FullRead to io.ReadFull, to match
   ReadAtLeast and ReadAll.
remove io.FullReader, because it is now unused.

R=r
DELTA=295  (88 added, 105 deleted, 102 changed)
OCL=30544
CL=30588

better error handling throughout.

R=r,rsc
APPROVED=r
DELTA=254  (201 added, 3 deleted, 50 changed)
OCL=30515
CL=30545

R=rsc
OCL=30542
CL=30542

R=rsc
APPROVED=rsc
DELTA=24  (24 added, 0 deleted, 0 changed)
OCL=30459
CL=30540

R=rsc
DELTA=30  (30 added, 0 deleted, 0 changed)
OCL=30536
CL=30536

R=ken
OCL=30519
CL=30534

named and unnamed.

R=r
DELTA=21  (21 added, 0 deleted, 0 changed)
OCL=30518
CL=30533

R=rsc
DELTA=25  (10 added, 7 deleted, 8 changed)
OCL=30516
CL=30531

APPROVED=r,rsc
DELTA=189  (187 added, 0 deleted, 2 changed)
OCL=30205
CL=30517

   in a cell makes a final cell in that line
   (this showed up as occasionally missing single spaces in
   godoc-formatted declarations that fit on a single line)

2) Cleaned up tabwriter implementation a bit:
   - replaced local unicodeLen() with utf8.RuneCount()
   - instead of having 2 parallel arrays for line widths and sizes,
     have a single array of cells containing a width and size
   - factored code a bit better
   - added more comments
   - added testnames to tabwriter tests
   - added more test cases and fixed a broken test case that
     now works correctly

R=r
DELTA=279  (133 added, 62 deleted, 84 changed)
OCL=30509
CL=30514

R=rsc
DELTA=3  (2 added, 0 deleted, 1 changed)
OCL=30511
CL=30513

R=r
DELTA=76  (1 added, 0 deleted, 75 changed)
OCL=30497
CL=30510

this assumes that embedded newlines are
legal in back-quote strings.

R=r
OCL=30502
CL=30502

R=r
DELTA=7  (2 added, 0 deleted, 5 changed)
OCL=30492
CL=30494

make builds; make install installs.

R=r
DELTA=2  (2 added, 0 deleted, 0 changed)
OCL=30489
CL=30491

- fixed nonsense sentence in numeric basic type section
- hlinted

R=r,rsc
DELTA=50  (10 added, 22 deleted, 18 changed)
OCL=30484
CL=30490

use it to avoid use of fixed ports in tests.
convert google/net/rpc to gotest

R=r
DELTA=523  (275 added, 229 deleted, 19 changed)
OCL=30458
CL=30460

some day...

TBR=r
OCL=30453
CL=30453

Rather than do that, fix build by
generating asm.h automatically.

R=r
DELTA=97  (48 added, 36 deleted, 13 changed)
OCL=30449
CL=30452

R=r
DELTA=37  (17 added, 15 deleted, 5 changed)
OCL=30428
CL=30444

R=r
DELTA=298  (119 added, 81 deleted, 98 changed)
OCL=30427
CL=30443

	* keep coherent SP/PC in gobuf
	  (i.e., SP that would be in use at that PC)
	* gogocall replaces setspgoto,
	  should work better in presence of link registers
	* delete unused system calls

only amd64; 386 is now broken

R=r
DELTA=548  (183 added, 183 deleted, 182 changed)
OCL=30381
CL=30442

- nil is not a keyword
- type -> Type

R=rsc
DELTA=10  (4 added, 0 deleted, 6 changed)
OCL=30433
CL=30435

runs on the same machine don't collide.

R=r
DELTA=4  (0 added, 1 deleted, 3 changed)
OCL=30426
CL=30429

R=r
DELTA=17  (17 added, 0 deleted, 0 changed)
OCL=30417
CL=30422