Fix issue 493: Infinite loop when debug break is set when entering function.apply

src/assembler.cc

Index: src/assembler.cc
===================================================================
--- src/assembler.cc	(revision 3200)
+++ src/assembler.cc	(working copy)
@@ -579,11 +579,16 @@
 }
 
 
-ExternalReference ExternalReference::address_of_stack_guard_limit() {
+ExternalReference ExternalReference::address_of_stack_limit() {
   return ExternalReference(StackGuard::address_of_jslimit());
 }
 
 
+ExternalReference ExternalReference::address_of_real_stack_limit() {
+  return ExternalReference(StackGuard::address_of_real_jslimit());
+}
+
+
 ExternalReference ExternalReference::address_of_regexp_stack_limit() {
   return ExternalReference(RegExpStack::limit_address());
 }