[wasm][asm.js] Store foreign init function for asm.js as internal field.

src/asmjs/asm-js.cc

Index: src/asmjs/asm-js.cc
diff --git a/src/asmjs/asm-js.cc b/src/asmjs/asm-js.cc
index b4026b0b191e934df8f0e7e0e9a1c396e54a771c..c296592ca92331e634c7e88d2fe3af7bdc875bcf 100644
--- a/src/asmjs/asm-js.cc
+++ b/src/asmjs/asm-js.cc
@@ -278,15 +278,11 @@ MaybeHandle<Object> AsmJs::InstantiateAsmWasm(i::Isolate* isolate,
     return MaybeHandle<Object>();
   }
 
-  i::Handle<i::Name> init_name(isolate->factory()->InternalizeUtf8String(
-      wasm::AsmWasmBuilder::foreign_init_name));
+  i::Handle<i::JSObject> module_object = maybe_module_object.ToHandleChecked();
+  i::Handle<i::Object> init(
+      module->GetInternalField(WasmModuleObject::kAsmForeignInit), isolate);
+  DCHECK(!init.is_null());
 
-  i::Handle<i::Object> module_object = maybe_module_object.ToHandleChecked();
-  i::MaybeHandle<i::Object> maybe_init =
-      i::Object::GetProperty(module_object, init_name);
-  DCHECK(!maybe_init.is_null());
-
-  i::Handle<i::Object> init = maybe_init.ToHandleChecked();
   i::Handle<i::Object> undefined(isolate->heap()->undefined_value(), isolate);
   i::Handle<i::Object>* foreign_args_array =
       new i::Handle<i::Object>[foreign_globals->length()];