[maglev] Add and enable --stress-maglev on fyi bots
.. which sets the --interrupt-budget-for-maglev to a very low value s.t. that tiering to Maglev happens very early. Note this affects both normal tierup and OSR. Also add flag handling to fuzzer.py, both as added globally with probability 0.1, and added to InterruptBudgetFuzzer (which I also updated with other tiering-related flags). Bug: v8:7700 Change-Id: I844cf53a6a2da459565d0ad0ccae02b04853cd26 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3878165Reviewed-by:Michael Achenbach <machenbach@chromium.org> Commit-Queue: Leszek Swirski <leszeks@chromium.org> Auto-Submit: Jakob Linke <jgruber@chromium.org> Reviewed-by:
Leszek Swirski <leszeks@chromium.org> Cr-Commit-Position: refs/heads/main@{#83033}
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