[wasm] WebAssembly.Memory object can be referenced by multiple Instance objects.

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");
 
 let kReturnValue = 117;
@@ skipping 197 matching lines @@
 
   var module = new WebAssembly.Module(builder.toBuffer());
   var i1 = new WebAssembly.Instance(module, null, mem_1);
   var i2 = new WebAssembly.Instance(module, null, mem_2);
 
   assertEquals(1, i1.exports.f());
   assertEquals(1000, i2.exports.f());
 })();
 
 (function MustBeMemory() {
+  print("MustBeMemory...");

[Mircea Trofin, 2016/11/09 18:57:10]

do you need this print?

[gdeepti, 2016/11/16 05:34:10]

This is consistent with other tests in this file that print the name of the test
running. I happened to stumble on it when this failed due to a missing return in
wasm-js.cc. and added it for consistence, debugging.  

   var memory = new ArrayBuffer(65536);
   var module = new WebAssembly.Module(buffer);
   assertThrows(() => new WebAssembly.Instance(module, null, memory), TypeError);
 })();