[wasm] Avoid js-typed-lowering optimization for wasm Memory objects

test/mjsunit/regress/wasm/regression-717194.js

+// Copyright 2017 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.
+
+PAGE_SIZE = 0x10000;
+PAGES = 10;
+
+memory = new WebAssembly.Memory({initial: PAGES});
+buffer = memory.buffer;
+
+var func = (function (stdlib, env, heap) {
+    "use asm";
+
+    var array = new stdlib.Int32Array(heap);
+
+    return function () {
+        array[0] = 0x41424344;
+        array[1] = 0x45464748;
+    }
+}({Int32Array: Int32Array}, {}, buffer));
+
+for (var i = 0; i < 1000; ++i)
+    func();
+
+memory.grow(1);
+
+func();
+
+for(var i = 0; i < 2; ++i)
+    new ArrayBuffer(PAGE_SIZE * PAGES);