[wasm] Rename the WASM object to _WASMEXP_.

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");
 
 var kReturnValue = 117;
 
@@ skipping 13 matching lines @@
   0, 0,                       // signature index
   kNameOffset, 0, 0, 0,       // name offset
   kBodySize, 0,               // body size
   // -- body
   kExprI8Const,               // --
   kReturnValue,               // --
   kDeclEnd,
   'm', 'a', 'i', 'n', 0       // name
 );
 
-var module = WASM.instantiateModule(data);
+var module = _WASMEXP_.instantiateModule(data);
 
 // 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;
 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);
 }
 
 assertEquals(1024, module.memory.byteLength);
 
 // Check the properties of the main function.
 assertFalse(module.main === undefined);
 assertFalse(module.main === null);
 assertFalse(module.main === 0);
 assertEquals("function", typeof module.main);
 
 assertEquals(kReturnValue, module.main());