[maglev] Add --maglev to numfuzz

Bug: v8:7700
Change-Id: I17f0df4e8ddf835af8231c5e06a6ecc416b3bc97
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3810181
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Jakob Linke <jgruber@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Jakob Linke <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82202}

tools/testrunner/testproc/fuzzer.py

@@ -18,6 +18,7 @@ EXTRA_FLAGS = [
     (0.2, '--future'),
     (0.1, '--interrupt-budget=100'),
     (0.1, '--liftoff'),
+    (0.1, '--maglev'),
     (0.2, '--no-analyze-environment-liveness'),
     # TODO(machenbach): Enable when it doesn't collide with crashing on missing
     # simd features.