First optimization in new compiler: simple GVN.

Change-Id: Ibe0efa4e84fd020a53ded310a92e0b4363f91b12
diff --git a/compiler/Android.mk b/compiler/Android.mk
index 35cddf9..7ac1c6b 100644
--- a/compiler/Android.mk
+++ b/compiler/Android.mk
@@ -94,6 +94,7 @@
 	optimizing/dead_code_elimination.cc \
 	optimizing/graph_checker.cc \
 	optimizing/graph_visualizer.cc \
+	optimizing/gvn.cc \
 	optimizing/locations.cc \
 	optimizing/nodes.cc \
 	optimizing/optimizing_compiler.cc \