delay calls to savex as long as possible.

R=ken
OCL=34535
CL=34546

R=rsc
OCL=34545
CL=34545

- first cut a better line breaks in expr lists
- trailing commas and semis printed where we tend to write them
- fixed a couple of minor spacing issues (interface{}, chan<-, map[x]y, x: y)
- removed some formatting flags from gofmt: no need to change default
- removed option to reverse declaration order when printing
- excluded files from test that cause trouble with idempotency test for now

R=rsc
DELTA=497  (364 added, 83 deleted, 50 changed)
OCL=34539
CL=34544

add makefile rules to build a binary named units as a demo.

R=r
DELTA=1257  (659 added, 597 deleted, 1 changed)
OCL=34528
CL=34530

R=r
DELTA=166  (0 added, 0 deleted, 166 changed)
OCL=34521
CL=34527

R=rsc
OCL=34526
CL=34526

TBR=r
OCL=34524
CL=34524

written in (c-style) go
produces go source parser

R=rsc
OCL=34522
CL=34522

OCL=34517
CL=34517

R=rsc
DELTA=51  (51 added, 0 deleted, 0 changed)
OCL=34516
CL=34516

- fixed some links

DELTA=51  (32 added, 1 deleted, 18 changed)
OCL=34497
CL=34515

init function context.
also moved composit literal
code from walk.c to sinit.c

R=rsc
OCL=34503
CL=34503

R=ken
OCL=34500
CL=34500

R=r
DELTA=9  (7 added, 0 deleted, 2 changed)
OCL=34499
CL=34499

R=rsc
DELTA=28  (7 added, 16 deleted, 5 changed)
OCL=34487
CL=34487

R=ken
OCL=34478
CL=34480

x == nil
x.go:5: cannot use nil as bool

c := x.(type);
x.go:88: use of .(type) outside type switch

R=ken
OCL=34476
CL=34476

universe block names.

BUG=2097244
R=ken
OCL=34295
CL=34473

R=ken
OCL=34471
CL=34471

R=ken
OCL=34465
CL=34470

R=rsc
DELTA=22  (19 added, 0 deleted, 3 changed)
OCL=34463
CL=34463

R=rsc
OCL=34462
CL=34462

- fixed a couple of broken links
- changed some explicit section references into implicit ones

R=r
DELTA=27  (0 added, 2 deleted, 25 changed)
OCL=34461
CL=34461

R=r
DELTA=24  (15 added, 0 deleted, 9 changed)
OCL=34447
CL=34458

- adjusted a test to check claim

R=rsc
DELTA=3  (2 added, 0 deleted, 1 changed)
OCL=34454
CL=34456

R=rsc
OCL=34453
CL=34455

they can get the official alignment out of there
instead of guessing.

R=ken
OCL=34450
CL=34450

add comments showing Go syntax for each token.
move doc comments below hidden begin constants

R=gri
DELTA=66  (3 added, 3 deleted, 60 changed)
OCL=34334
CL=34445

R=rsc
OCL=34434
CL=34434

almost done

R=rsc
OCL=34422
CL=34422

plateau - more to come

R=rsc
OCL=34413
CL=34413

R=rsc
APPROVED=rsc
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=34404
CL=34406

tweak test/literal.go to give more information.

R=austin
DELTA=45  (43 added, 0 deleted, 2 changed)
OCL=34381
CL=34398

successful.

R=rsc
APPROVED=rsc
DELTA=43  (31 added, 0 deleted, 12 changed)
OCL=34375
CL=34397

R=rsc
APPROVED=rsc
DELTA=314  (132 added, 2 deleted, 180 changed)
OCL=34376
CL=34396

R=rsc
APPROVED=rsc
DELTA=328  (112 added, 110 deleted, 106 changed)
OCL=34356
CL=34356

R=austin
DELTA=21  (5 added, 10 deleted, 6 changed)
OCL=34355
CL=34355

implementations can abort.  Make genConstant get values lazily
since we need the Thread now.

R=rsc
APPROVED=rsc
DELTA=299  (8 added, 19 deleted, 272 changed)
OCL=34353
CL=34353

R=austin
DELTA=34  (34 added, 0 deleted, 0 changed)
OCL=34280
CL=34352

including breakpoints and Go thread create/exit.

R=rsc
APPROVED=rsc
DELTA=751  (729 added, 6 deleted, 16 changed)
OCL=34345
CL=34351