.. 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}