Version 2.2.1
Debugger improvements.
Fixed minor bugs.

git-svn-id: http://v8.googlecode.com/svn/trunk@4346 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index bbb6e21..b5bb636 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -503,6 +503,9 @@
   // Abort execution if argument is not a number. Used in debug code.
   void AbortIfNotNumber(Register object, const char* msg);
 
+  // Abort execution if argument is not a smi. Used in debug code.
+  void AbortIfNotSmi(Register object, const char* msg);
+
   // ---------------------------------------------------------------------------
   // Exception handling