[asm] Fix lots of invalid asm.js tests

test/mjsunit/asm/int32array-unaligned.js

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 function Module(stdlib, foreign, heap) {
   "use asm";
   var MEM32 = new stdlib.Int32Array(heap);
   function load(i) {
     i = i|0;
     i = MEM32[i >> 2] | 0;
-    return i;
+    return i | 0;
   }
   function store(i, v) {
     i = i|0;
     v = v|0;
     MEM32[i >> 2] = v;
   }
   return { load: load, store: store };
 }
 
 var m = Module(this, {}, new ArrayBuffer(1024));
@@ skipping 12 matching lines @@
   for (var i = 0; i < 4; ++i) {
     assertEquals(0x12345678, m.load(i));
   }
   for (var i = 4; i < 8; ++i) {
     assertEquals(0x11223344, m.load(i));
   }
   for (var i = 8; i < 12; ++i) {
     assertEquals(-1, m.load(i));
   }
 }