Added a testcase to catch 2d array accesses. Throws NPE in KernelWriter.

test/codegen/src/java/com/amd/aparapi/test/Access2DIntArray.java

+package com.amd.aparapi.test;
+
+public class Access2DIntArray{
+   int[][] ints = new int[1024][];
+
+   public void run() {
+      for (int i = 0; i < 1024; i++) {
+         ints[i][0] = 1;
+      }
+   }
+}
+/**{Throws{ClassParseException}Throws}**/