Cleanup of mjsunit.js code and make assertEquals more strict.

test/mjsunit/compiler/logical-and.js

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 28 matching lines @@
 
 function AndNN(x,y) {
   return x && y;
 }
 
 assertTrue(AndBB(0, 0));
 assertFalse(AndBB(1, 0));
 assertFalse(AndBB(0, 1));
 assertFalse(AndBB(1, 1));
 
-assertFalse(AndBN(0, 0));
-assertTrue(AndBN(0, 1));
+assertEquals(0, AndBN(0, 0));
+assertEquals(1, AndBN(0, 1));
 assertFalse(AndBN(1, 0));
 assertEquals(1, AndBN(0, 1));
 assertEquals(2, AndBN(0, 2));
 assertFalse(AndBN(1, 1));
 assertFalse(AndBN(1, 2));
 
 assertEquals(0, AndNB(0, 0));
 assertTrue(AndNB(1, 0));
 assertEquals(0, AndNB(0, 1));
 assertEquals("", AndNB("", 1));
 assertFalse(AndNB(1, 1));
 assertTrue(AndNB(2, 0));
 
 assertEquals(0, AndNN(0, 0));
 assertEquals(0, AndNN(1, 0));
 assertEquals(0, AndNN(2, 0));
 assertEquals(0, AndNN(0, 1));
 assertEquals(0, AndNN(0, 2));
 assertEquals(1, AndNN(1, 1));
 assertEquals(2, AndNN(3, 2));