SafeStackFrameIterator used to skip over wasm frames, thus hiding them
for example in the Chrome profiler.

Change-Id: I81b1d73ab0b4fb1886f3300083a9550dc0f55525
Reviewed-on: https://chromium-review.googlesource.com/955697Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Stephan Herhut <herhut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51922}