Initiate a dead code elimination pass in the optimizing compiler.

Change-Id: Ie9db5d8e2c2c30e34145a0f7d2386b8ec58cfc4e
diff --git a/compiler/Android.mk b/compiler/Android.mk
index f76b66a..3d433d5 100644
--- a/compiler/Android.mk
+++ b/compiler/Android.mk
@@ -90,6 +90,7 @@
 	optimizing/code_generator_arm.cc \
 	optimizing/code_generator_x86.cc \
 	optimizing/code_generator_x86_64.cc \
+	optimizing/dead_code_elimination.cc \
 	optimizing/graph_checker.cc \
 	optimizing/graph_visualizer.cc \
 	optimizing/locations.cc \