Do not use user-defined __lookupGetter__ when generating stack trace.

src/messages.js

Index: src/messages.js
diff --git a/src/messages.js b/src/messages.js
index 0701c70eb6a129be041edcf59809b87c6ae54eb7..4da38051f9200746250867e23f9cc4228c524178 100644
--- a/src/messages.js
+++ b/src/messages.js
@@ -859,9 +859,9 @@ function CallSiteGetMethodName() {
   }
   var name = null;
   for (var prop in this.receiver) {
-    if (this.receiver.__lookupGetter__(prop) === this.fun ||
-        this.receiver.__lookupSetter__(prop) === this.fun ||
-        (!this.receiver.__lookupGetter__(prop) &&
+    if (%_CallFunction(this.receiver, prop, ObjectLookupGetter) === this.fun ||
+        %_CallFunction(this.receiver, prop, ObjectLookupSetter) === this.fun ||
+        (!%_CallFunction(this.receiver, prop, ObjectLookupGetter) &&
          this.receiver[prop] === this.fun)) {
       // If we find more than one match bail out to avoid confusion.
       if (name) {