I tested it with 30000 tests in the wasm spec test suite, and they all
pass.

Change-Id: Ice0fb64f56685f67521431213e3fc8fbc263750e
Reviewed-on: https://chromium-review.googlesource.com/822111Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50026}