Properly handle unsigned literals, fix typing issue with unary +.

Properly handle unsigned literals, fix typing issue with unary +.

Properly convert unsigned literals.
Forbid using unary + on a kAsmInt.
Forbid multiplies other than * 1.0 as being equivalent to unary +.

BUG= https://bugs.chromium.org/p/v8/issues/detail?id=4203
TEST=test-asm-validator,asm-wasm
R=titzer@chromium.org,aseemgarg@chromium.org
LOG=N

Committed: https://crrev.com/942ed114880b1cf1a72f9aa38d20759dd835b98e
Cr-Commit-Position: refs/heads/master@{#35046}

[bradn, 2016-03-23 20:16:11]

bradnelson@google.com changed reviewers:
+ bradnelson@google.com

[titzer, 2016-03-23 20:37:56]

lgtm

[bradn, 2016-03-23 20:39:01]

The CQ bit was checked by bradnelson@google.com

[commit-bot: I haz the power, 2016-03-23 20:39:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1832603002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1832603002/20001

[bradnelson, 2016-03-23 23:13:28]

The CQ bit was unchecked by bradnelson@chromium.org

[bradnelson, 2016-03-23 23:16:43]

The CQ bit was checked by bradnelson@chromium.org

[commit-bot: I haz the power, 2016-03-23 23:16:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1832603002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1832603002/20001

[commit-bot: I haz the power, 2016-03-23 23:20:01]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-03-23 23:21:29]

Description was changed from

==========
Properly handle unsigned literals, fix typing issue with unary +.

Properly convert unsigned literals.
Forbid using unary + on a kAsmInt.
Forbid multiplies other than * 1.0 as being equivalent to unary +.

BUG= https://bugs.chromium.org/p/v8/issues/detail?id=4203
TEST=test-asm-validator,asm-wasm
R=titzer@chromium.org,aseemgarg@chromium.org
LOG=N
==========

to

==========
Properly handle unsigned literals, fix typing issue with unary +.

Properly convert unsigned literals.
Forbid using unary + on a kAsmInt.
Forbid multiplies other than * 1.0 as being equivalent to unary +.

BUG= https://bugs.chromium.org/p/v8/issues/detail?id=4203
TEST=test-asm-validator,asm-wasm
R=titzer@chromium.org,aseemgarg@chromium.org
LOG=N

Committed: https://crrev.com/942ed114880b1cf1a72f9aa38d20759dd835b98e
Cr-Commit-Position: refs/heads/master@{#35046}
==========

[commit-bot: I haz the power, 2016-03-23 23:21:30]

Patchset 2 (id:??) landed as
https://crrev.com/942ed114880b1cf1a72f9aa38d20759dd835b98e
Cr-Commit-Position: refs/heads/master@{#35046}