Add EmitNamedStore and CallStoreIC(name, is_contextual) to x64 platform.

src/x64/virtual-frame-x64.h

Index: src/x64/virtual-frame-x64.h
===================================================================
--- src/x64/virtual-frame-x64.h	(revision 5107)
+++ src/x64/virtual-frame-x64.h	(working copy)
@@ -341,7 +341,7 @@
   // and by the order of the three arguments on the frame.
   Result CallCommonStoreIC(Handle<Code> ic,
                            Result* value,
-                           Result *key,
+                           Result* key,
                            Result* receiver);
 
   // Call store IC.  Name, value, and receiver are found on top
@@ -354,6 +354,10 @@
     return CallCommonStoreIC(ic, &value, &name, &receiver);
   }
 
+  // Call store IC.  If the load is contextual, value is found on top of the
+  // frame.  If not, value and receiver are on the frame.  Both are dropped.
+  Result CallStoreIC(Handle<String> name, bool is_contextual);
+
   // Call keyed store IC.  Value, key, and receiver are found on top
   // of the frame.  All are dropped.
   Result CallKeyedStoreIC() {