Remove code that adjusts synced and copied flags in MergeTo.

src/virtual-frame.cc

Index: src/virtual-frame.cc
===================================================================
--- src/virtual-frame.cc	(revision 1997)
+++ src/virtual-frame.cc	(working copy)
@@ -218,12 +218,6 @@
       ASSERT(source.is_valid());
       elements_[i].clear_sync();
     }
-
-    elements_[i].clear_copied();
-    if (elements_[i].is_copy()) {
-      elements_[elements_[i].index()].set_copied();
-    }
-
     // No code needs to be generated to change the static type of an
     // element.
     elements_[i].set_static_type(target.static_type());