Cache field lowering info in mir_graph.

Change-Id: I9f9d76e3ae6c31e88bdf3f59820d31a625da020f
diff --git a/compiler/Android.mk b/compiler/Android.mk
index b1b6fc5..2f785ce 100644
--- a/compiler/Android.mk
+++ b/compiler/Android.mk
@@ -50,6 +50,7 @@
 	dex/quick/x86/utility_x86.cc \
 	dex/dex_to_dex_compiler.cc \
 	dex/mir_dataflow.cc \
+	dex/mir_field_info.cc \
 	dex/mir_optimization.cc \
 	dex/pass_driver.cc \
 	dex/bb_optimizations.cc \