ART: Fix type parameter in tests

Move Class to Class<?>, Constructor to Constructor<?>, and in
general clean up reflection.

Test: m test-art-host-run-test
Change-Id: I3a4223ee8d14d032015edf34bf27135757f7138c
diff --git a/test/148-multithread-gc-annotations/src/AnnoClass3.java b/test/148-multithread-gc-annotations/src/AnnoClass3.java
index 5b4a378..7d600a8 100644
--- a/test/148-multithread-gc-annotations/src/AnnoClass3.java
+++ b/test/148-multithread-gc-annotations/src/AnnoClass3.java
@@ -19,5 +19,5 @@
 @Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.TYPE)
 public @interface AnnoClass3 {
-    Class value();
+    Class<?> value();
 }