Now that register validation is working again, re-enable
for asm->wasm embenchen tests.

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

Review URL: https://codereview.chromium.org/1724043002

Cr-Commit-Position: refs/heads/master@{#34223}