change Type to gobType.
fix some bugs around recursive structures.
lots of cleanup.
add the first cut at a type encoder.

R=rsc
DELTA=400  (287 added, 11 deleted, 102 changed)
OCL=31401
CL=31406

R=ken
OCL=31399
CL=31399

R=rsc
OCL=31396
CL=31396

  - rename untar{,_test}.go to reader{,_test}.go.
  - fix up some comments.
  - improve test output if it fails.

R=rsc
APPROVED=rsc
DELTA=821  (400 added, 392 deleted, 29 changed)
OCL=31376
CL=31378

add channel send type check (thanks austin).
fix type mismatch message.

R=r
DELTA=241  (225 added, 5 deleted, 11 changed)
OCL=31370
CL=31375

R=rsc
OCL=31373
CL=31373

R=rsc
APPROVED=rsc
DELTA=456  (382 added, 66 deleted, 8 changed)
OCL=31246
CL=31372

so remove code from go.y.

show original types in badtype; don't remove pointers.
not sure why this was here but it confuses things
if the bad part involves two named pointer types
with different names but the same pointed-at type.

R=ken
OCL=31369
CL=31369

R=r
DELTA=188  (171 added, 6 deleted, 11 changed)
OCL=31352
CL=31361

- moved test files from data to testdata
- use tabs instead of spaces for layout

R=rsc
DELTA=129  (67 added, 60 deleted, 2 changed)
OCL=31353
CL=31360

R=r
OCL=31359
CL=31359

R=rsc
DELTA=41  (41 added, 0 deleted, 0 changed)
OCL=31349
CL=31358

R=r
DELTA=304  (248 added, 34 deleted, 22 changed)
OCL=31345
CL=31347

R=rsc
DELTA=28  (7 added, 7 deleted, 14 changed)
OCL=31312
CL=31322

R=rsc
DELTA=169  (168 added, 0 deleted, 1 changed)
OCL=31319
CL=31321

R=r
DELTA=167  (0 added, 167 deleted, 0 changed)
OCL=31304
CL=31316

- fix a bug w/ optional semicolons

R=rsc
DELTA=46  (24 added, 0 deleted, 22 changed)
OCL=31306
CL=31311

R=ken
OCL=31310
CL=31310

R=gri
APPROVED=gri
DELTA=73  (48 added, 0 deleted, 25 changed)
OCL=31302
CL=31308

Please correct as needed.

R=rsc,r
DELTA=10  (4 added, 1 deleted, 5 changed)
OCL=31305
CL=31305

R=rsc
DELTA=35  (0 added, 34 deleted, 1 changed)
OCL=31301
CL=31303

- fixed typo in parser.go
- removed test w/ syntax errors from gofmt test script

R=rsc
DELTA=25  (21 added, 0 deleted, 4 changed)
OCL=31296
CL=31298

R=ken
OCL=31295
CL=31295

R=r
DELTA=12  (0 added, 0 deleted, 12 changed)
OCL=31240
CL=31290

R=r
DELTA=242  (68 added, 69 deleted, 105 changed)
OCL=31239
CL=31289

R=r
DELTA=16  (3 added, 1 deleted, 12 changed)
OCL=31121
CL=31288

R=r
DELTA=186  (55 added, 8 deleted, 123 changed)
OCL=31117
CL=31287

R=r
DELTA=192  (52 added, 43 deleted, 97 changed)
OCL=31116
CL=31286

R=gri
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=31115
CL=31285

R=gri
DELTA=70  (7 added, 17 deleted, 46 changed)
OCL=31113
CL=31283

R=austin
DELTA=3  (0 added, 0 deleted, 3 changed)
OCL=31112
CL=31282

R=r
DELTA=208  (37 added, 63 deleted, 108 changed)
OCL=31111
CL=31281

tests to use new reflect interface.

also make tests a real gotest.

depends on CL 31107

R=r
DELTA=582  (56 added, 194 deleted, 332 changed)
OCL=31108
CL=31279

R=ken
OCL=31122
CL=31278

in place of sigi, sigt.

R=ken
OCL=31118
CL=31277

rename ntype.go and nvalue.go to type.go and value.go

R=r
DELTA=4295  (761 added, 2819 deleted, 715 changed)
OCL=31238
CL=31276

be independent of each other

R=rsc
DELTA=28  (28 added, 0 deleted, 0 changed)
OCL=31271
CL=31273

R=rsc
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=31270
CL=31272

s.output.Data() was being retrieved before the synchronization
point, which meant that it could be retrieved before the
goroutine wrote it.  Using gccgo this caused random errors.

R=gri
DELTA=2  (1 added, 0 deleted, 1 changed)
OCL=31046
CL=31267

and make 5c, 8c use them.

centralizes reachability analysis
and switch generation.

now 8c doesn't have spurious warnings
in pkg/runtime.

R=ken
OCL=31266
CL=31266