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This CL enables WebAssembly trap handlers on MacOS. In this CL we use
the default trap handler provided by V8.

Bug: chromium:906565

Change-Id: I2d007da1a86ca05010a0a7bf830586767f19a24d
Reviewed-on: https://chromium-review.googlesource.com/c/1290955
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609942}