[wasm] Memory is exported on the module.exports object.

test/mjsunit/wasm/instantiate-module-basic.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
 
 load("test/mjsunit/wasm/wasm-constants.js");
 load("test/mjsunit/wasm/wasm-module-builder.js");
 
 var kReturnValue = 117;
 
 var module = (function Build() {
   var builder = new WasmModuleBuilder();
 
   builder.addMemory(1, 1, true);
   builder.addFunction("main", [kAstI32])
     .addBody([kExprI8Const, kReturnValue])
     .exportFunc();
 
   return builder.instantiate();
 })();
 
 // Check the module exists.
 assertFalse(module === undefined);
 assertFalse(module === null);
 assertFalse(module === 0);
 assertEquals("object", typeof module);
 
 // Check the memory is an ArrayBuffer.
-var mem = module.memory;
+var mem = module.exports.memory;
 assertFalse(mem === undefined);
 assertFalse(mem === null);
 assertFalse(mem === 0);
 assertEquals("object", typeof mem);
 assertTrue(mem instanceof ArrayBuffer);
 for (var i = 0; i < 4; i++) {
-  module.memory = 0;  // should be ignored
-  assertEquals(mem, module.memory);
+  module.exports.memory = 0;  // should be ignored
+  assertEquals(mem, module.exports.memory);
 }
 
-assertEquals(65536, module.memory.byteLength);
+assertEquals(65536, module.exports.memory.byteLength);
 
 // Check the properties of the main function.
 var main = module.exports.main;
 assertFalse(main === undefined);
 assertFalse(main === null);
 assertFalse(main === 0);
 assertEquals("function", typeof main);
 
 assertEquals(kReturnValue, main());