The current typing-asm mishandles the relationship between
unsigned numbers and int. Restructuring and using type shortcuts
that approximate asm types.

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

Review URL: https://codereview.chromium.org/1447133002

Cr-Commit-Position: refs/heads/master@{#32057}