Dead code elimination based on GVN results.

Change-Id: I5b77411a8f088f0b561da14b123cf6b0501c9db5
diff --git a/compiler/dex/dex_flags.h b/compiler/dex/dex_flags.h
index eaf272b..e8eb40c 100644
--- a/compiler/dex/dex_flags.h
+++ b/compiler/dex/dex_flags.h
@@ -27,6 +27,7 @@
   kNullCheckElimination,
   kClassInitCheckElimination,
   kGlobalValueNumbering,
+  kGvnDeadCodeElimination,
   kLocalValueNumbering,
   kPromoteRegs,
   kTrackLiveTemps,