Disable wide arithmetic in fuzzers

Contributing.md

@@ -30,3 +30,7 @@ Use this handy checklist to make sure your new instructions are fully supported:
  - [ ] JS API tested in test/binaryen.js/kitchen-sink.js
  - [ ] Tests added in test/spec
  - [ ] Tests added in test/lit
+    - [ ] Tests are used as seeds for the fuzzer. If V8 doesn't support the
+    test, or if the new instruction isn't guarded by a wasm-validator check,
+    then either add the corresponding feature to DISALLOWED_FEATURES_IN_V8 or 
+    mark the test as unfuzzable.

scripts/bundle_clusterfuzz.py

@@ -111,6 +111,7 @@
     '--disable-stack-switching',
     '--disable-relaxed-atomics',
     '--disable-multibyte',
+    '--disable-wide-arithmetic',
 ]
 
 with tarfile.open(output_file, "w:gz") as tar:

scripts/clusterfuzz/run.py

@@ -95,6 +95,7 @@
     '--disable-strings',
     '--disable-stack-switching',
     '--disable-relaxed-atomics',
+    '--disable-wide-arithmetic',
 ]
 
 

scripts/fuzz_opt.py

@@ -77,6 +77,7 @@
     'stack-switching',
     'relaxed-atomics',
     'multibyte',
+    'wide-arithmetic',
 ]
 
 
@@ -916,7 +917,7 @@ def can_run(self, wasm):
         if random.random() < 0.5:
             return False
         # wasm2c doesn't support most features
-        return all_disallowed(['exception-handling', 'simd', 'threads', 'bulk-memory', 'nontrapping-float-to-int', 'tail-call', 'sign-ext', 'reference-types', 'multivalue', 'gc', 'custom-descriptors', 'relaxed-atomics'])
+        return all_disallowed(['exception-handling', 'simd', 'threads', 'bulk-memory', 'nontrapping-float-to-int', 'tail-call', 'sign-ext', 'reference-types', 'multivalue', 'gc', 'custom-descriptors', 'relaxed-atomics', 'wide-arithmetic'])
 
     @override
     def run(self, wasm):
@@ -1237,7 +1238,7 @@ def can_run_on_wasm(self, wasm):
         # implement wasm suspending using JS async/await.
         if JSPI:
             return False
-        return all_disallowed(['exception-handling', 'simd', 'threads', 'bulk-memory', 'nontrapping-float-to-int', 'tail-call', 'sign-ext', 'reference-types', 'multivalue', 'gc', 'multimemory', 'memory64', 'custom-descriptors', 'relaxed-atomics'])
+        return all_disallowed(['exception-handling', 'simd', 'threads', 'bulk-memory', 'nontrapping-float-to-int', 'tail-call', 'sign-ext', 'reference-types', 'multivalue', 'gc', 'multimemory', 'memory64', 'custom-descriptors', 'relaxed-atomics', 'wide-arithmetic'])
 
 
 # Returns the wat for a wasm file. If it is already wat, it just returns that