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

test/mjsunit/wasm/asm-wasm-f32.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 WrapInAsmModule(func) {
   function MODULE_NAME(stdlib) {
     "use asm";
     var fround = stdlib.Math.fround;
     var Math_ceil = stdlib.Math.ceil;
     var Math_floor = stdlib.Math.floor;
     var Math_sqrt = stdlib.Math.sqrt;
     var Math_abs = stdlib.Math.abs;
     var Math_min = stdlib.Math.min;
@@ skipping 220 matching lines @@
             assertEquals(func(a / 11,  b), module.main(a / 11, b));
             assertEquals(func(a, b / 420.9), module.main(a, b / 420.9));
             assertEquals(func(a / -31.1, b), module.main(a / -31.1, b));
           }
         }
       }
     });
   }
 
 })();