[wasm] Fix stupid arguments.

test/mjsunit/wasm/test-wasm-module-builder.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');
 
-var debug = (((typeof arguments) != undefined) && arguments[0] == "debug");
-
 (function BasicTest() {
     var module = new WasmModuleBuilder();
     module.addMemory(1, 2, false);
     module.addFunction("foo", [kAstI32])
         .addBody([kExprI8Const, 11])
         .exportAs("blarg");
 
     var buffer = module.toBuffer(debug);
     var instance = _WASMEXP_.instantiateModule(buffer);
     assertEquals(11, instance.exports.blarg());
@@ skipping 59 matching lines @@
     module.addMemory(1, 1, false);
     module.addFunction("load", [kAstI32, kAstI32])
         .addBody([kExprI32LoadMem, 0, kExprGetLocal, 0])
         .exportAs("load");
     module.addDataSegment(0, [9, 9, 9, 9], true);
 
     var buffer = module.toBuffer(debug);
     var instance = _WASMEXP_.instantiateModule(buffer);
     assertEquals(151587081, instance.exports.load(0));
 })();