This is a reland of ed2605f0

Original change's description:
> [d8][wasm] Test wasm compilation completion
> 
> d8 was recently changed to keep running until wasm compilation has
> completed. This adds a message test to test that.
> 
> R=ahaas@chromium.org
> 
> Change-Id: I73af53b6df4ee5f9a6afd26cf2d71a269140465f
> Reviewed-on: https://chromium-review.googlesource.com/966184
> Reviewed-by: Andreas Haas <ahaas@chromium.org>
> Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#52008}

Change-Id: Iadbd5056dfa58da454956c4e89369af8b0455b35
Reviewed-on: https://chromium-review.googlesource.com/975242Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52154}