fix int type coercion in asm to wasm

test/mjsunit/wasm/asm-wasm.js

 // Copyright 2015 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
 
 function EmptyTest() {
   "use asm";
   function caller() {
     empty();
     return 11;
   }
   function empty() {
   }
   return {caller: caller};
 }
 
 assertEquals(11, _WASMEXP_.instantiateModuleFromAsm(
       EmptyTest.toString()).caller());
 
 
 function IntTest() {
   "use asm";
   function sum(a, b) {
     a = a|0;
     b = b|0;
     var c = (b + 1)|0
     var d = 3.0;
-    var e = d | 0;  // double conversion
+    var e = ~~d;  // double conversion
     return (a + c + 1)|0;
   }
 
   function caller() {
     return sum(77,22) | 0;
   }
 
   return {caller: caller};
 }
 
@@ skipping 1033 matching lines @@
   var foreign = new ffi();
 
   var module = _WASMEXP_.instantiateModuleFromAsm(AsmModule.toString(),
                                                   foreign, null);
 
   module.__init__();
   assertEquals(89, module.caller(83, 83.25));
 }
 
 TestForeignFunctionMultipleUse();