[heap] Turn on fuzzing for map space compaction

Turn on fuzzing to get additional test coverage.

Bug: v8:12578
Change-Id: Ia614fb9e4ba519163024f3b7b40f22ad6ebb3297
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3442677Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78977}

tools/clusterfuzz/clusterfuzz_trials_config.json

 [
     {"app_args": "--assert-types", "app_name": "d8", "probability": 0.25},
     {"app_args": "--budget_for_feedback_vector_allocation=0", "app_name": "d8", "probability": 0.05},
+    {"app_args": "--compact-map-space", "app_name": "d8", "probability": 0.25},
     {"app_args": "--force-slow-path", "app_name": "d8", "probability": 0.05},
     {"app_args": "--future", "app_name": "d8", "probability": 0.25},
     {"app_args": "--interrupt-budget=1000", "app_name": "d8", "probability": 0.25},

tools/clusterfuzz/v8_fuzz_flags.json

@@ -30,5 +30,6 @@
   [0.05, "--budget-for-feedback-vector-allocation=0"],
   [0.1, "--no-wasm-generic-wrapper"],
   [0.1, "--turbo-force-mid-tier-regalloc"],
-  [0.0001, "--simulate-errors"]
+  [0.0001, "--simulate-errors"],
+  [0.25, "--compact-map-space"]
 ]

tools/testrunner/testproc/fuzzer.py

@@ -15,6 +15,7 @@ EXTRA_FLAGS = [
     (0.1, '--assert-types'),
     (0.1, '--budget-for-feedback-vector-allocation=0'),
     (0.1, '--cache=code'),
+    (0.25, '--compact-map-space'),
     (0.1, '--force-slow-path'),
     (0.2, '--future'),
     (0.1, '--interrupt-budget=100'),