- Extend http.URLUnescape to convert '+' to space
- Add http.URLEscape
- Rename URL.Query to EncodedQuery (and stop decoding it, as decoding this field
  before separating key/value pairs loses important information)
- Report a clean error on incomplete hex escapes
- Update existing tests, add new ones

APPROVED=rsc
DELTA=293  (256 added, 3 deleted, 34 changed)
OCL=29685
CL=29759

associated with CL 29709.

R=r
DELTA=6444  (3476 added, 2958 deleted, 10 changed)
OCL=29710
CL=29724

auto-generated files and deletions are in another CL.

goals for new syscall:
	* automate as much as possible
	* do not let clients do unsafe things
	* use simple types (int not int64)
	* fewer files

the files are renamed from foo_amd64_linux to foo_linux_amd64,
both because it reads better (all the linux are related, all the amd64 less so)
and because it made it easier to replace the existing ones.

R=r
DELTA=2336  (2260 added, 6 deleted, 70 changed)
OCL=29709
CL=29723

R=r
DELTA=713  (109 added, 386 deleted, 218 changed)
OCL=29707
CL=29722

R=r
DELTA=121  (92 added, 4 deleted, 25 changed)
OCL=29706
CL=29721

R=r,rsc
DELTA=2871  (1712 added, 1118 deleted, 41 changed)
OCL=29222
CL=29704

so that it can be used for non-Go chars
- adjust parser accordingly

R=rsc
DELTA=58  (42 added, 2 deleted, 14 changed)
OCL=29688
CL=29703

R=r,rsc
DELTA=64  (63 added, 0 deleted, 1 changed)
OCL=29702
CL=29702

in complex literals. side effect is
fix of error in initializerr.go

R=r
OCL=29667
CL=29667

allow multiline recipes in run.

R=r
DELTA=712  (708 added, 2 deleted, 2 changed)
OCL=29641
CL=29666

The change to assign.go is because the gcc testsuite fails to
handle .* in a normal way: it matches against the entire
compiler output, not just a single line.

assign.go:15:6: error: incompatible types in assignment (implicit assignment of 'sync.Mutex' hidden field 'key')
assign.go:19:6: error: incompatible types in assignment (implicit assignment of 'sync.Mutex' hidden field 'key')
assign.go:23:6: error: incompatible types in assignment (implicit assignment of 'sync.Mutex' hidden field 'key')
assign.go:27:6: error: incompatible types in assignment (implicit assignment of 'sync.Mutex' hidden field 'key')

chan/perm.go:14:5: error: incompatible types in assignment
chan/perm.go:15:5: error: incompatible types in assignment
chan/perm.go:16:6: error: incompatible types in assignment
chan/perm.go:17:6: error: incompatible types in assignment
chan/perm.go:24:7: error: invalid send on receive-only channel
chan/perm.go:25:12: error: invalid send on receive-only channel
chan/perm.go:31:4: error: invalid receive on send-only channel
chan/perm.go:32:9: error: invalid receive on send-only channel
chan/perm.go:38:2: error: invalid send on receive-only channel
chan/perm.go:42:2: error: invalid receive on send-only channel

initializerr.go:14:17: error: reference to undefined variable 'X'
initializerr.go:14:19: error: mixture of field and value initializers
initializerr.go:15:26: error: duplicate value for field 'Y'
initializerr.go:16:10: error: too many values in struct composite literal
initializerr.go:18:19: error: index expression is not integer constant
initializerr.go:17:11: error: too many elements in composite literal

R=rsc
DELTA=12  (0 added, 0 deleted, 12 changed)
OCL=29657
CL=29665

R=ken
OCL=29651
CL=29653

R=r
OCL=29646
CL=29646

1. ar reports names of objects with duplicate text symbols.
2. gobuild only shows first line of error output for each failed command.
3. gobuild ignores files that begin with ascii non-alphanumeric non _.

; gobuild
$ 6g -I _obj gobuild.go
  gobuild.go:150: PackageImports: undefined
$ 6g -I _obj makefile.go
  makefile.go:102: ShellString: undefined
$ 6g -I _obj util.go
  util.go:114: syntax error near zzz
gobuild: stalemate
;

; gobuild
$ 6ar grc _obj/gobuild.a util.6 util1.6
  duplicate text symbol: util1.6 and util.6: gobuild·Build
$ 6g -I _obj gobuild.go
  gobuild.go:150: PackageImports: undefined
$ 6g -I _obj makefile.go
  makefile.go:102: ShellString: undefined
gobuild: stalemate
;

R=r
DELTA=95  (49 added, 9 deleted, 37 changed)
OCL=29625
CL=29640

bug157 and bug158

R=rsc
DELTA=59  (59 added, 0 deleted, 0 changed)
OCL=29632
CL=29634

[]int -> string is already in the document.

DELTA=7  (1 added, 1 deleted, 5 changed)
OCL=29622
CL=29631

*** Reason for rollback ***

  these semicolons are necessary only because of a bug in 6g

*** Original change description ***

add missing semicolons in example

TBR=gri
OCL=29624
CL=29624

R=r
OCL=29623
CL=29623

R=r
OCL=29619
CL=29619

R=r
DELTA=46  (46 added, 0 deleted, 0 changed)
OCL=29569
CL=29614

R=r
OCL=29612
CL=29612

The code was already careful not to use malloc/free
for stack growth during calls to malloc.
Avoid them during calls to free too.

R=r
DELTA=9  (7 added, 0 deleted, 2 changed)
OCL=29606
CL=29610

R=ken
OCL=29577
CL=29589

passes ridiculous test from CL 29569.

R=ken
OCL=29571
CL=29573

R=ken
OCL=29568
CL=29570

R=r
OCL=29544
CL=29544

fewer moves, fewer stupid LEALs.
powser1 runs (with evaln commented out).
beginnings of floating point.

R=ken
OCL=29540
CL=29543

get the code going.

R=rsc
APPROVED=rsc
DELTA=4752  (1723 added, 948 deleted, 2081 changed)
OCL=29403
CL=29530

R=rsc
APPROVED=rsc
DELTA=132  (16 added, 45 deleted, 71 changed)
OCL=29468
CL=29497

	* conversions all in one place.
	* no separate load, store phases;
	  direct memory addressing when possible
	  (this is the x86 after all!).
	  avoids extra registers, extra MOVQs.
	* fixes int32 -> uint64 bug
	  (was zero-extending)

R=ken
OCL=29482
CL=29484

R=r
OCL=29479
CL=29479

R=rsc
DELTA=5  (0 added, 0 deleted, 5 changed)
OCL=29475
CL=29478

R=r
DELTA=1  (0 added, 1 deleted, 0 changed)
OCL=29473
CL=29477

between first and second pass of converting
[]int to string.

R=r
OCL=29467
CL=29467

R=r
OCL=29466
CL=29466

R=ken
OCL=29448
CL=29448

R=dsymonds
DELTA=5  (5 added, 0 deleted, 0 changed)
OCL=29424
CL=29447

R=rsc
DELTA=35  (35 added, 0 deleted, 0 changed)
OCL=29442
CL=29444

TBR=rsc
DELTA=14  (14 added, 0 deleted, 0 changed)
OCL=29441
CL=29441

R=ken
OCL=29425
CL=29427