[maglev] Support Switch on PostDominatingHole calculation
A switch can only produce a hole if it does not have fallthrough. This actually only happens for SwitchOnGeneratorState bytecode. We calculate the highest post dominating hole by traversing each target. Bug: v8:7700 Change-Id: Ia86ac08b1062dc48296e24beb95b3e3c3418ea6b Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3826045 Auto-Submit: Victor Gomes <victorgomes@chromium.org> Reviewed-by: Jakob Linke <jgruber@chromium.org> Commit-Queue: Victor Gomes <victorgomes@chromium.org> Cr-Commit-Position: refs/heads/main@{#82529}
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