* update mksyscall.sh and rebuild syscall/z*.go
 * fix a few linux-only files

R=r
DELTA=455  (12 added, 1 deleted, 442 changed)
OCL=34637
CL=34655

TBR=rsc
DELTA=56  (56 added, 0 deleted, 0 changed)
OCL=34652
CL=34652

- printing of expressions: put spaces only where "needed"
- printing of import statements: no double indentation if there are no renames
- print labels on separate lines
- added extra test files

go/ast:
- unified basic literal nodes and as a result deleted duplicated code
- added initial code to track scopes (not fully used yet)

replaces CL 34553

R=rsc
DELTA=881  (579 added, 223 deleted, 79 changed)
OCL=34623
CL=34651

R=r
DELTA=127  (38 added, 3 deleted, 86 changed)
OCL=34640
CL=34650

DELTA=23  (19 added, 1 deleted, 3 changed)
OCL=34646
CL=34649

DELTA=174  (65 added, 10 deleted, 99 changed)
OCL=34625
CL=34639

the last round omitted := range and only
checked 1 out of N vars in a multi-var :=

R=r
OCL=34624
CL=34638

also template/template.go, missed last time.

R=r
DELTA=116  (61 added, 10 deleted, 45 changed)
OCL=34620
CL=34622

fix some bugs involving _.

R=ken
OCL=34621
CL=34621

SimpleStmt was always used as an option.

fix bug: divide is a right shift

DELTA=8  (0 added, 0 deleted, 8 changed)
OCL=34612
CL=34614

R=r
DELTA=112  (6 added, 57 deleted, 49 changed)
OCL=34610
CL=34610

R=r
DELTA=3  (3 added, 0 deleted, 0 changed)
OCL=34606
CL=34609

R=r
DELTA=2  (1 added, 0 deleted, 1 changed)
OCL=34605
CL=34608

R=ken
OCL=34604
CL=34604

R=gri
DELTA=12  (12 added, 0 deleted, 0 changed)
OCL=34601
CL=34601

R=rsc
DELTA=125  (103 added, 22 deleted, 0 changed)
OCL=34586
CL=34598

the first IDAT chunk.

R=rsc
APPROVED=rsc
DELTA=7  (2 added, 0 deleted, 5 changed)
OCL=34583
CL=34585

R=rsc
DELTA=83  (83 added, 0 deleted, 0 changed)
OCL=34584
CL=34584

DELTA=15  (6 added, 1 deleted, 8 changed)
OCL=34549
CL=34564

R=rsc
APPROVED=r
DELTA=694  (675 added, 3 deleted, 16 changed)
OCL=34427
CL=34554

TBR=rsc
OCL=34550
CL=34552

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