jni: Support @FastNative methods that return objects

Bug: 32088975
Change-Id: I16f8b7ec6b251812af60ab25f2153d9b72f37044
diff --git a/compiler/utils/assembler_thumb_test.cc b/compiler/utils/assembler_thumb_test.cc
index 86a4aa2..10bed13 100644
--- a/compiler/utils/assembler_thumb_test.cc
+++ b/compiler/utils/assembler_thumb_test.cc
@@ -158,7 +158,7 @@
       }
       if (CompareIgnoringSpace(results[lineindex], testline) != 0) {
         LOG(FATAL) << "Output is not as expected at line: " << lineindex
-          << results[lineindex] << "/" << testline;
+          << results[lineindex] << "/" << testline << ", test name: " << testname;
       }
       ++lineindex;
     }