SafeStackFrameIterator::Advance() will stop at wasm_to_js frames, so we
should fully expect that they show up when calling frame() after
Advance().

This fixes some breakages for profiling wasm and asm.js.

Bug: chromium:1010534, v8:10150
Change-Id: Ifc78cd9eba33e777b33fc1cbea19ee376b25299c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2019485Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65980}