Add missing error message for calling functions on incompatible receivers.

src/regexp-delay.js

Index: src/regexp-delay.js
===================================================================
--- src/regexp-delay.js	(revision 3960)
+++ src/regexp-delay.js	(working copy)
@@ -142,7 +142,7 @@
 
 function RegExpExec(string) {
   if (!IS_REGEXP(this)) {
-    throw MakeTypeError('method_called_on_incompatible',
+    throw MakeTypeError('incompatible_method_receiver',
                         ['RegExp.prototype.exec', this]);
   }
   if (%_ArgumentsLength() == 0) {
@@ -199,7 +199,7 @@
 // else implements.
 function RegExpTest(string) {
   if (!IS_REGEXP(this)) {
-    throw MakeTypeError('method_called_on_incompatible',
+    throw MakeTypeError('incompatible_method_receiver',
                         ['RegExp.prototype.test', this]);
   }
   if (%_ArgumentsLength() == 0) {