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

src/assembler.h

Index: src/assembler.h
===================================================================
--- src/assembler.h	(revision 3200)
+++ src/assembler.h	(working copy)
@@ -406,8 +406,11 @@
   static ExternalReference roots_address();
 
   // Static variable StackGuard::address_of_jslimit()
-  static ExternalReference address_of_stack_guard_limit();
+  static ExternalReference address_of_stack_limit();
 
+  // Static variable StackGuard::address_of_real_jslimit()
+  static ExternalReference address_of_real_stack_limit();
+
   // Static variable RegExpStack::limit_address()
   static ExternalReference address_of_regexp_stack_limit();