Add test to verify lto mutators

Test: go test lto_test
Change-Id: I37577ae1836eaf73fa17c76ebdd5801c0fd7f098
diff --git a/cc/Android.bp b/cc/Android.bp
index 2963c77..8860f78 100644
--- a/cc/Android.bp
+++ b/cc/Android.bp
@@ -99,6 +99,7 @@
         "library_headers_test.go",
         "library_stub_test.go",
         "library_test.go",
+        "lto_test.go",
         "ndk_test.go",
         "object_test.go",
         "prebuilt_test.go",