Allow bitwise operators to convert from intish to int in heap ops.

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();
@@ skipping 1505 matching lines @@
       var y = 2.0;
       return (x & y) | 0;
     }
     return {func: func};
   }
 
   assertThrows(function() {
     _WASMEXP_.instantiateModuleFromAsm(Module.toString());
   });
 })();
+
+
+(function TestAndIntishAndFromHeap() {

[aseemgarg, 2016/02/24 02:16:21]

Better name? TestAndIntAndHeapValue?

[bradn, 2016/02/24 07:15:20]

Done.

+  function Module(stdlib, foreign, buffer) {
+    "use asm";
+    var HEAP32 = new stdlib.Int32Array(buffer);
+    function func() {
+      var x = 0;
+      x = HEAP32[0] & -1;
+      return x | 0;
+    }
+    return {func: func};
+  }
+
+  var m = _WASMEXP_.instantiateModuleFromAsm(Module.toString());
+  assertEquals(0, m.func());
+})();