Add support for RSASTReplace for ref-counting.

BUG=3092382

Change-Id: Ia17d40753952e4a021b39549a082cc4b3f20916c
diff --git a/Android.mk b/Android.mk
index a1ee9c0..89baa5e 100644
--- a/Android.mk
+++ b/Android.mk
@@ -196,6 +196,7 @@
 LOCAL_SRC_FILES :=	\
 	llvm-rs-cc.cpp	\
 	slang_rs.cpp	\
+	slang_rs_ast_replace.cpp	\
 	slang_rs_context.cpp	\
 	slang_rs_pragma_handler.cpp	\
 	slang_rs_backend.cpp	\