- derive int, uint, float, uintptr decoders based on their size
- add overflow checks in decode

R=rsc
DELTA=407  (281 added, 44 deleted, 82 changed)
OCL=32286
CL=32290

R=rsc
DELTA=16  (16 added, 0 deleted, 0 changed)
OCL=32288
CL=32288

R=rsc
DELTA=5  (5 added, 0 deleted, 0 changed)
OCL=32283
CL=32287

R=r,gri,rsc
APPROVED=rsc
DELTA=53  (12 added, 6 deleted, 35 changed)
OCL=31822
CL=32282

pointer to the Type instead of the address of the Type.

R=rsc
APPROVED=rsc
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=32265
CL=32279

R=ken
OCL=32261
CL=32261

unpacking for assignments, call arguments, and returns.  This
change revamps the whole assignment compilation system to be
multi-valued, using the new MultiType type and multiV value.
Function calls, returns, and assignments now share a lot of
code and produce very consistent error messages.

R=rsc
APPROVED=rsc
DELTA=510  (335 added, 74 deleted, 101 changed)
OCL=32248
CL=32258

R=ken
OCL=32257
CL=32257

R=rsc
DELTA=160  (124 added, 0 deleted, 36 changed)
OCL=32233
CL=32256

R=ken
OCL=32255
CL=32255

R=ken
OCL=32253
CL=32253

R=ken
OCL=32252
CL=32252

for slice or string x.

R=ken
OCL=32249
CL=32249

R=rsc
APPROVED=rsc
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=32245
CL=32247

R=ken
OCL=32244
CL=32244

	a := true;
	a |= a;
in the front end.

R=ken
OCL=32240
CL=32243

R=ken
OCL=32239
CL=32239

the size of chunk with uncompressed data (00 is terms of DEFLATE).

APPROVED=rsc
DELTA=15  (14 added, 0 deleted, 1 changed)
OCL=32105
CL=32238

saving of sp was too far away from use in scanstack;
the stack had changed since the sp was saved.

R=r
DELTA=9  (4 added, 2 deleted, 3 changed)
OCL=32232
CL=32237

function calling.  Implement a type compiler and named types.
Implement a universal scope containing built-in named types,
and some built-in constants.  Implement a simple virtual
machine for executing statements and single-valued return.

Fix many places that incorrectly dealt with named types.  In
particular, the Type.Zero methods now use the type's bit count
to determine the appropriate value representation.  As a
result, a bit count of 0 now means architecture-dependent and
bounded types use unsafe.Sizeof to determine the correct
bounds.  Previously, the bounds on a 32-bit machine would have
been wrong.

Eliminated Type.compatible, since the implementation is
equivalent for all types.  Added Type.rep that shallowly
strips named types.  Replaced almost all uses of Type.literal
with Type.rep.

Fix implementation of assign-op's so it only evaluates the
left side once.  As part of this, there is now a generic way
to separate out the effect and value of an expression.

R=rsc
APPROVED=rsc
DELTA=1530  (1244 added, 68 deleted, 218 changed)
OCL=32184
CL=32230

TBR=r
OCL=32225
CL=32225

R=rsc
DELTA=298  (202 added, 0 deleted, 96 changed)
OCL=32006
CL=32224

R=gri
DELTA=2  (2 added, 0 deleted, 0 changed)
OCL=32214
CL=32223

R=r,iant
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=32215
CL=32222

R=r
APPROVED=gri
DELTA=23  (23 added, 0 deleted, 0 changed)
OCL=32106
CL=32189

fails without crashing.

R=gri
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=32164
CL=32171

so that golden.out does not include
the name of the compiler (which is
arch-specific and shows up in diffs).

R=r,iant
DELTA=3  (0 added, 0 deleted, 3 changed)
OCL=31980
CL=31983

if there is a goroutine waiting to run
and the init goroutine enters a system call,
entersyscall was trying to kick off a new
scheduler for the other goroutine, causing
a panic (new goroutines can't run until main.main).

R=r
DELTA=32  (32 added, 0 deleted, 0 changed)
OCL=31982
CL=31982

R=r
DELTA=51  (14 added, 24 deleted, 13 changed)
OCL=31968
CL=31971

just like ONAME etc.

R=ken
OCL=31964
CL=31964

R=rsc
DELTA=16  (9 added, 3 deleted, 4 changed)
OCL=31956
CL=31963

R=rsc
APPROVED=rsc
DELTA=591  (497 added, 76 deleted, 18 changed)
OCL=31933
CL=31955

as go is concerned).  the -d flag is now flipped; as on the mac, -d disables dynamic.

much remains to be improved to move the output closer to the gcc format.

R=rsc
DELTA=366  (310 added, 30 deleted, 26 changed)
OCL=31929
CL=31951

R=rsc
DELTA=3  (0 added, 0 deleted, 3 changed)
OCL=31944
CL=31950

- use array for common small values
- integer.go, rational.go don't contain changes besides the added file header

R=rsc
DELTA=1475  (748 added, 713 deleted, 14 changed)
OCL=31939
CL=31942

R=rsc
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=31916
CL=31937

R=r
DELTA=12  (12 added, 0 deleted, 0 changed)
OCL=31915
CL=31936

R=rsc
DELTA=195  (146 added, 1 deleted, 48 changed)
OCL=31895
CL=31931

all type-specific value functions, and use ZeroVal to create
new frames.  Remove Value.Type; it was unused and difficult
for values with composite types.  Add Value.Assign methods.

R=rsc
APPROVED=rsc
DELTA=282  (135 added, 90 deleted, 57 changed)
OCL=31894
CL=31930

R=rsc
DELTA=5  (0 added, 0 deleted, 5 changed)
OCL=31900
CL=31900