Check CallSite arguments more rigorously

src/js/messages.js

Index: src/js/messages.js
diff --git a/src/js/messages.js b/src/js/messages.js
index d48bd5cfbbf6d5b5b8a181f0c595f148790a12fe..439043f809c5b50151c3313ed8e6b88e9e484d11 100644
--- a/src/js/messages.js
+++ b/src/js/messages.js
@@ -275,8 +275,8 @@ function GetStackTraceLine(recv, fun, pos, isGlobal) {
 function CallSite(receiver, fun, pos, strict_mode) {
   // For wasm frames, receiver is the wasm object and fun is the function index
   // instead of an actual function.
-  if (!IS_FUNCTION(fun) && !IS_NUMBER(fun)) {
-    throw MakeTypeError(kCallSiteExpectsFunction, typeof fun);
+  if (!IS_FUNCTION(fun) && !%IsWasmObject(receiver)) {
+    throw MakeTypeError(kCallSiteExpectsFunction, typeof receiver, typeof fun);
   }
 
   if (IS_UNDEFINED(new.target)) {