Enable JS interop in V8 flags (#8425)

Enabling this feature will allow configuring JS prototypes on Wasm
structs via their descriptors. This will help the fuzzer find bugs where
those configured prototypes are accidentally removed.

Author: tlively

scripts/clusterfuzz/run.py

@@ -32,7 +32,7 @@
 
 # The V8 flags we put in the "fuzzer flags" files, which tell ClusterFuzz how to
 # run V8. By default we apply all staging flags.
-FUZZER_FLAGS = '--wasm-staging --experimental-wasm-custom-descriptors'
+FUZZER_FLAGS = '--wasm-staging --experimental-wasm-custom-descriptors --experimental-wasm-js-interop'
 
 # Optional V8 flags to add to FUZZER_FLAGS, some of the time.
 OPTIONAL_FUZZER_FLAGS = [

scripts/test/shared.py

@@ -253,6 +253,7 @@ def has_shell_timeout():
     '--experimental-wasm-stringref',
     '--experimental-wasm-fp16',
     '--experimental-wasm-custom-descriptors',
+    '--experimental-wasm-js-interop',
 ]
 
 # external tools