Adding a version of embenchen, modified to pass through
the asm->wasm javascript interface.
Disabling for now as fixes required to run it are outstanding.

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

Review URL: https://codereview.chromium.org/1716273002

Cr-Commit-Position: refs/heads/master@{#34217}