[wasm][asm.js] Fix and enable several asm.js tests with the new parser.

test/mjsunit/wasm/asm-wasm-copy.js

 // Copyright 2016 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.
 
-// Flags: --expose-wasm
+// Flags: --expose-wasm --validate-asm --fast-validate-asm
 
 (function TestCopyBug() {
   // This was tickling a register allocation issue with
   // idiv in embenchen/copy.
   function asmModule(){
     'use asm';
     function func() {
       var ret = 0;
       var x = 1, y = 0, z = 0;
       var a = 0, b = 0, c = 0, d = 0, e = 0, f = 0, g = 0;
       do {
         y = (x + 0) | 0;
         z = (y | 0) % 2 | 0;
         ret = (y + z + a + b + c + d + e + f + g) | 0;
       } while(0);
       return ret | 0;
     }
     return { func: func };
   }
   var wasm = asmModule();
   var js = eval('(' + asmModule.toString().replace('use asm', '') + ')')();
   assertEquals(js.func(), wasm.func());
 })();