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/517-checker-builder-fallthrough/src/Main.java b/test/517-checker-builder-fallthrough/src/Main.java
index 23d94e6..14170f5 100644
--- a/test/517-checker-builder-fallthrough/src/Main.java
+++ b/test/517-checker-builder-fallthrough/src/Main.java
@@ -20,7 +20,7 @@
 
   public static int runTest(int input) throws Exception {
     Class<?> c = Class.forName("TestCase");
-    Method m = c.getMethod("testCase", new Class[] { int.class });
+    Method m = c.getMethod("testCase", int.class);
     return (Integer) m.invoke(null, input);
   }