Check CallSite arguments more rigorously

src/runtime/runtime-internal.cc

Index: src/runtime/runtime-internal.cc
diff --git a/src/runtime/runtime-internal.cc b/src/runtime/runtime-internal.cc
index 7a6c5362b0cc759884f4dc957f9eb037ab51574e..1bfa6894858cafe5eae22d5c6c2514ff9be29b89 100644
--- a/src/runtime/runtime-internal.cc
+++ b/src/runtime/runtime-internal.cc
@@ -13,6 +13,7 @@
 #include "src/isolate-inl.h"
 #include "src/messages.h"
 #include "src/parsing/parser.h"
+#include "src/wasm/wasm-module.h"
 
 namespace v8 {
 namespace internal {
@@ -595,5 +596,14 @@ RUNTIME_FUNCTION(Runtime_OrdinaryHasInstance) {
       isolate, Object::OrdinaryHasInstance(isolate, callable, object));
 }
 
+RUNTIME_FUNCTION(Runtime_IsWasmObject) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(1, args.length());
+  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
+  bool is_wasm_object = object->IsJSObject() &&
+                        wasm::IsWasmObject(Handle<JSObject>::cast(object));
+  return *isolate->factory()->ToBoolean(is_wasm_object);
+}
+
 }  // namespace internal
 }  // namespace v8