[wasm] asm.js - Remove Wasm.instantiateModuleFromAsm, use asm.js directly.

test/mjsunit/regress/regress-wasm-crbug-599413.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: --validate-asm --allow-natives-syntax
 
 function __f_100() {
   "use asm";
   function __f_76() {
     var __v_39 = 0;
     outer: while (1) {
       while (__v_39 == 4294967295) {
       }
     }
   }
   return {__f_76: __f_76};
 }
-assertThrows(function() {
-  Wasm.instantiateModuleFromAsm(__f_100.toString());
-});
+assertTrue(%IsNotAsmWasmCode(__f_100));