Remove some unnecessary warning suppression annotations

com.ibm.wala.core.testdata/src/reflection/Reflect3.java

@@ -16,7 +16,6 @@ public class Reflect3 {
 
   public static void main(String[] args) throws ClassNotFoundException, IllegalAccessException, InstantiationException {
     Class<?> c = Class.forName("java.util.Properties");
-    @SuppressWarnings("unchecked")
     Hashtable<Object, Object> h = (Hashtable<Object, Object>) c.newInstance();
     System.out.println(h.toString());
   }

com.ibm.wala.core.testdata/src/reflection/Reflect7.java

@@ -20,7 +20,6 @@ import java.lang.reflect.InvocationTargetException;
  * 
  */
 public class Reflect7 {
-  @SuppressWarnings("unchecked")
   public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException,
       IllegalArgumentException, InstantiationException, IllegalAccessException, InvocationTargetException {
     Class<FilePermission> c = (Class<FilePermission>) Class.forName("java.io.FilePermission");

com.ibm.wala.core.tests/src/com/ibm/wala/core/tests/callGraph/ReflectionTest.java

@@ -247,7 +247,6 @@ public class ReflectionTest extends WalaTestCase {
     Assert.assertTrue(succNodes.isEmpty());
   }
 
-  @SuppressWarnings("unchecked")
   @Test
   public void testReflect7() throws Exception {
     AnalysisScope scope = findOrCreateAnalysisScope();

com.ibm.wala.core.tests/src/com/ibm/wala/core/tests/ir/AnnotationTest.java

@@ -104,7 +104,6 @@ public class AnnotationTest extends WalaTestCase {
   }
 
 
-  @SuppressWarnings("unchecked")
   @Test
   public void testClassAnnotations3() throws Exception {