[asm] Fix lots of invalid asm.js tests

test/mjsunit/asm/do-while.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, buffer) {
   "use asm";
   function f(i) {
-    var j;
     i = i|0;
+    var j = 0;
     do {
-      if (i > 0) {
-        j = i != 0;
+      if ((i | 0) > 0) {
+        j = (i | 0) != 0;
         i = (i - 1) | 0;
       } else {
         j = 0;
       }
     } while (j);
-    return i;
+    return i | 0;
   }
   return {f:f};
 }
 
 var m = Module(this, {}, new ArrayBuffer(64*1024));
 
 assertEquals(-1, m.f("-1"));
 assertEquals(0, m.f(-Math.infinity));
 assertEquals(0, m.f(undefined));
 assertEquals(0, m.f(0));
 assertEquals(0, m.f(1));
 assertEquals(0, m.f(100));