asm.js permits both:
int * constant
constant * int

It does not, however, allow intishes in multiplies.

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

Review URL: https://codereview.chromium.org/1718083004

Cr-Commit-Position: refs/heads/master@{#34222}