[es6] Tail calls support.

src/ic/ic.h

Index: src/ic/ic.h
diff --git a/src/ic/ic.h b/src/ic/ic.h
index a3265d70b9aedd7f548006cc8e0de3bbc3646c9c..3ee56b14ed0493911ffef46e9412b89a87cb9dc2 100644
--- a/src/ic/ic.h
+++ b/src/ic/ic.h
@@ -284,9 +284,11 @@ class CallIC : public IC {
 
   // Code generator routines.
   static Handle<Code> initialize_stub(Isolate* isolate, int argc,
-                                      ConvertReceiverMode mode);
+                                      ConvertReceiverMode mode,
+                                      TailCallMode tail_call_mode);
   static Handle<Code> initialize_stub_in_optimized_code(
-      Isolate* isolate, int argc, ConvertReceiverMode mode);
+      Isolate* isolate, int argc, ConvertReceiverMode mode,
+      TailCallMode tail_call_mode);
 
   static void Clear(Isolate* isolate, Code* host, CallICNexus* nexus);
 };