TEST=asm-wasm.js
R=titzer@chromium.org,bradnelson@chromium.org
BUG=

Add for loop to asm-to-wasm

TEST=asm-wasm.js
R=titzer@chromium.org,bradnelson@google.com

Review URL: https://codereview.chromium.org/1530093002

Cr-Commit-Position: refs/heads/master@{#33101}