[wasm] Do not unregister an ArrayBuffer if it is already external

src/wasm/wasm-js.cc

Index: src/wasm/wasm-js.cc
diff --git a/src/wasm/wasm-js.cc b/src/wasm/wasm-js.cc
index bd371c0c50819ad5def070357e54b9951ea8de11..b5b0235fa563a277b748949aa9b2d6f97121ec8c 100644
--- a/src/wasm/wasm-js.cc
+++ b/src/wasm/wasm-js.cc
@@ -740,7 +740,8 @@ void WebAssemblyMemoryGrow(const v8::FunctionCallbackInfo<v8::Value>& args) {
     thrower.RangeError("Unable to grow instance memory.");
     return;
   }
-  i::wasm::DetachWebAssemblyMemoryBuffer(i_isolate, old_buffer);
+  bool free_memory = (delta_size != 0);
+  i::wasm::DetachWebAssemblyMemoryBuffer(i_isolate, old_buffer, free_memory);
   v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
   return_value.Set(ret);
 }