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

test/mjsunit/asm/regress-674089.js

 // Copyright 2017 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 --ignition --lazy-inner-functions
+// Flags: --validate-asm --ignition --lazy-inner-functions --fast-validate-asm
 
 function outer() {
   "use asm";
   function inner() {
     switch (1) {
       case 0:
         break foo;
     }
   }
 }
 outer();