Start allowing heavier testing of maglev by allowing graph building to
bail out if passed an unsupported bytecode.

Bug: v8:7700
Change-Id: I7e3d2c5a8896d4f4e0da5ef444c95a286f9ac117
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3500417Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79371}