See usage in the js-api tests; previously it would have thrown without
executing any tests. Now, it can be used to generate trapping functions.

Bug: v8:8319
Change-Id: Ia1643d8f337a10ea86c1e700c7702ed7d3ed0c97
Reviewed-on: https://chromium-review.googlesource.com/c/1352298Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57885}