Add a pretty printer to improve the error message non-function calls

src/runtime.js

Index: src/runtime.js
diff --git a/src/runtime.js b/src/runtime.js
index 8ae676110be18cf955f7339dcbab9f43b5d8f58c..6bbb375e767681e5b6f238a096fee76cd2921236 100644
--- a/src/runtime.js
+++ b/src/runtime.js
@@ -377,7 +377,9 @@ function FILTER_KEY(key) {
 function CALL_NON_FUNCTION() {
   var delegate = %GetFunctionDelegate(this);
   if (!IS_FUNCTION(delegate)) {
-    throw %MakeTypeError('called_non_callable', [typeof this]);
+    var callsite = %RenderCallSite();
+    if (callsite == "") callsite = typeof this;
+    throw %MakeTypeError('called_non_callable', [callsite]);
   }
   return %Apply(delegate, this, arguments, 0, %_ArgumentsLength());
 }
@@ -386,7 +388,9 @@ function CALL_NON_FUNCTION() {
 function CALL_NON_FUNCTION_AS_CONSTRUCTOR() {
   var delegate = %GetConstructorDelegate(this);
   if (!IS_FUNCTION(delegate)) {
-    throw %MakeTypeError('called_non_callable', [typeof this]);
+    var callsite = %RenderCallSite();
+    if (callsite == "") callsite = typeof this;
+    throw %MakeTypeError('called_non_callable', [callsite]);
   }
   return %Apply(delegate, this, arguments, 0, %_ArgumentsLength());
 }