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

test/mjsunit/wasm/asm-wasm-deopt.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: --validate-asm --allow-natives-syntax
+// Flags: --validate-asm --allow-natives-syntax --fast-validate-asm
 
 (function TestDeoptimizeArgMismatch() {
   function deopt() {
     %DeoptimizeFunction(test);
   }
   function Module(global, env, buffer) {
     "use asm";
     var deopt = env.deopt;
     function _main(i4, i5) {
       i4 = i4 | 0;
       i5 = i5 | 0;
       deopt();
       return i5 | 0;
     }
     return {'_main': _main}
   }
   function test() {
     var wasm = Module(null, {'deopt': deopt});
     wasm._main(0, 0, 0);
   }
   test();
 })();