Enable embenchen/copy for wasm.

test/mjsunit/wasm/asm-wasm-copy.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
+
+(function TestCopyBug() {
+  // This was tickling a register allocation issue with
+  // idiv in embenchen/copy.
+  function asmModule(){
+    'use asm';
+    function func() {
+      var ret = 0;
+      var x = 1, y = 0, z = 0;
+      var a = 0, b = 0, c = 0, d = 0, e = 0, f = 0, g = 0;
+      do {
+        y = (x + 0) | 0;
+        z = (y | 0) % 2 | 0;
+        ret = (y + z + a + b + c + d + e + f + g) | 0;
+      } while(0);
+      return ret | 0;
+    }
+    return { func: func };
+  }
+  var wasm = Wasm.instantiateModuleFromAsm(asmModule.toString());
+  assertEquals(asmModule().func(), wasm.func());
+})();