various bugfixes

classpath/java/util/HashMap.java

@@ -52,7 +52,7 @@ public class HashMap<K, V> implements Map<K, V> {
           Cell<K, V> next;
           for (Cell<K, V> c = array[i]; c != null; c = next) {
             next = c.next();
-            int index = c.getKey().hashCode() & (capacity - 1);
+            int index = c.hashCode() & (capacity - 1);
             c.setNext(array[index]);
             array[index] = c;
           }