[asm] Fix lots of invalid asm.js tests

test/mjsunit/asm/uint8array-outofbounds.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 MEM8 = new stdlib.Uint8Array(heap);
   function load(i) {
     i = i|0;
     i = MEM8[i] | 0;
-    return i;
+    return i | 0;
   }
   function store(i, v) {
     i = i|0;
     v = v|0;
     MEM8[i] = v;
   }
   return { load: load, store: store };
 }
 
 var m = Module(this, {}, new ArrayBuffer(1));
 
 m.store(0, 255);
 for (var i = 1; i < 64; ++i) {
   m.store(i * 1 * 32 * 1024, i);
 }
 assertEquals(255, m.load(0));
 for (var i = 1; i < 64; ++i) {
   assertEquals(0, m.load(i * 1 * 32 * 1024));
 }