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/080-oom-throw/src/Main.java b/test/080-oom-throw/src/Main.java
index f007b25..0ae92a9 100644
--- a/test/080-oom-throw/src/Main.java
+++ b/test/080-oom-throw/src/Main.java
@@ -105,7 +105,7 @@
     static boolean triggerReflectionOOM() {
         try {
             Class<?> c = Main.class;
-            Method m = c.getMethod("blowup", (Class[]) null);
+            Method m = c.getMethod("blowup");
             holder = new Object[1000000];
             m.invoke(null);
             holder = null;