[foozzie] Limit wasm memory size

Memory limits are difference on 32-bit and 64-bit systems, so foozzie
finds differences in Wasm execution.
This can be avoided by always setting the same (lower) limit.

R=machenbach@chromium.org

Bug: chromium:1348335
Change-Id: I452d257fd78730b4113bfe67120dbed2e8ba5878
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3804696Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82200}

tools/clusterfuzz/foozzie/testdata/failure_output.txt

@@ -9,9 +9,9 @@
 # Compared x64,ignition with x64,ignition_turbo
 #
 # Flags of x64,ignition:
---correctness-fuzzer-suppressions --expose-gc --fuzzing --allow-natives-for-differential-fuzzing --invoke-weak-callbacks --omit-quit --harmony --wasm-staging --no-wasm-async-compilation --suppress-asm-messages --random-seed 12345 --turbo-filter=~ --no-turbofan --no-sparkplug --liftoff --no-wasm-tier-up --flag1 --flag2=0
+--correctness-fuzzer-suppressions --expose-gc --fuzzing --allow-natives-for-differential-fuzzing --invoke-weak-callbacks --omit-quit --harmony --wasm-staging --no-wasm-async-compilation --wasm-max-mem-pages=32767 --suppress-asm-messages --random-seed 12345 --turbo-filter=~ --no-turbofan --no-sparkplug --liftoff --no-wasm-tier-up --flag1 --flag2=0
 # Flags of x64,ignition_turbo:
---correctness-fuzzer-suppressions --expose-gc --fuzzing --allow-natives-for-differential-fuzzing --invoke-weak-callbacks --omit-quit --harmony --wasm-staging --no-wasm-async-compilation --suppress-asm-messages --random-seed 12345 --flag3
+--correctness-fuzzer-suppressions --expose-gc --fuzzing --allow-natives-for-differential-fuzzing --invoke-weak-callbacks --omit-quit --harmony --wasm-staging --no-wasm-async-compilation --wasm-max-mem-pages=32767 --suppress-asm-messages --random-seed 12345 --flag3
 #
 # Difference:
 - unknown

tools/clusterfuzz/foozzie/testdata/failure_output_arch.txt

@@ -9,9 +9,9 @@
 # Compared x64,ignition with x64,ignition_turbo
 #
 # Flags of x64,ignition:
---correctness-fuzzer-suppressions --expose-gc --fuzzing --allow-natives-for-differential-fuzzing --invoke-weak-callbacks --omit-quit --harmony --wasm-staging --no-wasm-async-compilation --suppress-asm-messages --random-seed 12345 --turbo-filter=~ --no-turbofan --no-sparkplug --liftoff --no-wasm-tier-up
+--correctness-fuzzer-suppressions --expose-gc --fuzzing --allow-natives-for-differential-fuzzing --invoke-weak-callbacks --omit-quit --harmony --wasm-staging --no-wasm-async-compilation --wasm-max-mem-pages=32767 --suppress-asm-messages --random-seed 12345 --turbo-filter=~ --no-turbofan --no-sparkplug --liftoff --no-wasm-tier-up
 # Flags of x64,ignition_turbo:
---correctness-fuzzer-suppressions --expose-gc --fuzzing --allow-natives-for-differential-fuzzing --invoke-weak-callbacks --omit-quit --harmony --wasm-staging --no-wasm-async-compilation --suppress-asm-messages --random-seed 12345 --bad-flag
+--correctness-fuzzer-suppressions --expose-gc --fuzzing --allow-natives-for-differential-fuzzing --invoke-weak-callbacks --omit-quit --harmony --wasm-staging --no-wasm-async-compilation --wasm-max-mem-pages=32767 --suppress-asm-messages --random-seed 12345 --bad-flag
 #
 # Difference:
 + bad behavior

tools/clusterfuzz/foozzie/testdata/failure_output_second.txt

@@ -9,9 +9,9 @@
 # Compared x64,ignition with ia32,ignition_turbo
 #
 # Flags of x64,ignition:
---correctness-fuzzer-suppressions --expose-gc --fuzzing --allow-natives-for-differential-fuzzing --invoke-weak-callbacks --omit-quit --harmony --wasm-staging --no-wasm-async-compilation --suppress-asm-messages --random-seed 12345 --turbo-filter=~ --no-turbofan --no-sparkplug --liftoff --no-wasm-tier-up
+--correctness-fuzzer-suppressions --expose-gc --fuzzing --allow-natives-for-differential-fuzzing --invoke-weak-callbacks --omit-quit --harmony --wasm-staging --no-wasm-async-compilation --wasm-max-mem-pages=32767 --suppress-asm-messages --random-seed 12345 --turbo-filter=~ --no-turbofan --no-sparkplug --liftoff --no-wasm-tier-up
 # Flags of ia32,ignition_turbo:
---correctness-fuzzer-suppressions --expose-gc --fuzzing --allow-natives-for-differential-fuzzing --invoke-weak-callbacks --omit-quit --harmony --wasm-staging --no-wasm-async-compilation --suppress-asm-messages --random-seed 12345 --very-bad-flag
+--correctness-fuzzer-suppressions --expose-gc --fuzzing --allow-natives-for-differential-fuzzing --invoke-weak-callbacks --omit-quit --harmony --wasm-staging --no-wasm-async-compilation --wasm-max-mem-pages=32767 --suppress-asm-messages --random-seed 12345 --very-bad-flag
 #
 # Difference:
 + very bad behavior

tools/clusterfuzz/foozzie/testdata/smoke_test_output.txt

@@ -9,9 +9,9 @@
 # Compared x64,ignition with x64,ignition_turbo
 #
 # Flags of x64,ignition:
---correctness-fuzzer-suppressions --expose-gc --fuzzing --allow-natives-for-differential-fuzzing --invoke-weak-callbacks --omit-quit --harmony --wasm-staging --no-wasm-async-compilation --suppress-asm-messages --random-seed 12345 --turbo-filter=~ --no-turbofan --no-sparkplug --liftoff --no-wasm-tier-up
+--correctness-fuzzer-suppressions --expose-gc --fuzzing --allow-natives-for-differential-fuzzing --invoke-weak-callbacks --omit-quit --harmony --wasm-staging --no-wasm-async-compilation --wasm-max-mem-pages=32767 --suppress-asm-messages --random-seed 12345 --turbo-filter=~ --no-turbofan --no-sparkplug --liftoff --no-wasm-tier-up
 # Flags of x64,ignition_turbo:
---correctness-fuzzer-suppressions --expose-gc --fuzzing --allow-natives-for-differential-fuzzing --invoke-weak-callbacks --omit-quit --harmony --wasm-staging --no-wasm-async-compilation --suppress-asm-messages --random-seed 12345
+--correctness-fuzzer-suppressions --expose-gc --fuzzing --allow-natives-for-differential-fuzzing --invoke-weak-callbacks --omit-quit --harmony --wasm-staging --no-wasm-async-compilation --wasm-max-mem-pages=32767 --suppress-asm-messages --random-seed 12345
 #
 # Difference:
 - unknown

tools/clusterfuzz/foozzie/v8_commands.py

@@ -25,6 +25,9 @@ DEFAULT_FLAGS = [
     '--harmony',
     '--wasm-staging',
     '--no-wasm-async-compilation',
+    # Limit wasm memory to just below 2GiB, to avoid differences between 32-bit
+    # and 64-bit builds.
+    '--wasm-max-mem-pages=32767',
     '--suppress-asm-messages',
 ]