This makes sure instantiate of asm.js modules fails gracefully on heap
buffers exceeding the uint32_t range supported by WebAssembly.

R=clemensh@chromium.org
TEST=mjsunit/regress/regress-crbug-754175
BUG=chromium:754175

Change-Id: I4a9c6791beaab6da826b5b6b5a495f97e9d3b4e9
Reviewed-on: https://chromium-review.googlesource.com/632618Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47598}