wasm: change the module memory size to be multiples of the page size, 64k.

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;
 
 var kBodySize = 2;
 var kNameOffset = kHeaderSize + 19 + kBodySize + 1;
 
 var data = bytesWithHeader(
   // -- memory
   kDeclMemory,
-  10, 10, 1,
+  1, 1, 1,
   // -- signatures
   kDeclSignatures, 1,
   0, kAstI32,                 // signature: void -> int
   // -- main function
   kDeclFunctions, 1,
   kDeclFunctionName | kDeclFunctionExport,
   0, 0,                       // signature index
   kNameOffset, 0, 0, 0,       // name offset
   kBodySize, 0,               // body size
   // -- body
@@ skipping 16 matching lines @@
 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);
+assertEquals(65536, 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());