[wasm] Fix and tighten memory validation

test/mjsunit/wasm/memory-size.js

 // Copyright 2016 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");
 
 (function testMemorySizeZero() {
   print("testMemorySizeZero()");
   var builder = new WasmModuleBuilder();
+  builder.addMemory(0, 0, false);
   builder.addFunction("memory_size", kSig_i_v)
          .addBody([kExprMemorySize, kMemoryZero])
          .exportFunc();
   var module = builder.instantiate();
   assertEquals(0, module.exports.memory_size());
 })();
 
 (function testMemorySizeNonZero() {
   print("testMemorySizeNonZero()");
   var builder = new WasmModuleBuilder();
   var size = 11;
   builder.addMemory(size, size, false);
   builder.addFunction("memory_size", kSig_i_v)
          .addBody([kExprMemorySize, kMemoryZero])
          .exportFunc();
   var module = builder.instantiate();
   assertEquals(size, module.exports.memory_size());
 })();