[heap] Turn on fuzzing for MinorMC

Based on bots and local testing, MinorMC has reached a stable state in
terms of correctness.
Enable fuzzing with MinorMC to flush out additional issues.

Bug: v8:12612
Change-Id: I9cf8c5791d7256ff63c777b295863506436ee165
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3872265Reviewed-by: Almothana Athamneh <almuthanna@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83190}

tools/clusterfuzz/foozzie/v8_fuzz_flags.json

@@ -31,5 +31,6 @@
   [0.1, "--no-wasm-generic-wrapper"],
   [0.1, "--turbo-force-mid-tier-regalloc"],
   [0.0001, "--simulate-errors"],
-  [0.25, "--no-use-map-space"]
+  [0.25, "--no-use-map-space"],
+  [0.1, "--minor-mc"]
 ]

tools/clusterfuzz/trials/clusterfuzz_trials_config.json

@@ -7,6 +7,7 @@
     {"app_args": "--interrupt-budget=1000", "app_name": "d8", "probability": 0.25},
     {"app_args": "--jitless", "app_name": "d8", "probability": 0.1},
     {"app_args": "--maglev", "app_name": "d8", "probability": 0.1, "contradicts": ["--jitless"]},
+    {"app_args": "--minor-mc", "app_name": "d8", "probability": 0.1},
     {"app_args": "--random-gc-interval=2000", "app_name": "d8", "probability": 0.05},
     {"app_args": "--noanalyze-environment-liveness", "app_name": "d8", "probability": 0.1},
     {"app_args": "--no-enable-avx", "app_name": "d8", "probability": 0.1},

tools/testrunner/testproc/fuzzer.py

@@ -21,6 +21,7 @@ EXTRA_FLAGS = [
     # (0.1, '--interrupt-budget-for-maglev=100'),
     (0.1, '--liftoff'),
     (0.1, '--maglev'),
+    (0.1, '--minor-mc'),
     (0.2, '--no-analyze-environment-liveness'),
     # TODO(machenbach): Enable when it doesn't collide with crashing on missing
     # simd features.