[Interpreter] Refactor bytecode generator test suite.

test/cctest/interpreter/generate-bytecode-expectations.cc

 // 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.
 
 #include <cstring>
 #include <fstream>
 
 #include "test/cctest/interpreter/bytecode-expectations-printer.h"
 
 #include "include/libplatform/libplatform.h"
@@ skipping 363 matching lines @@
     printer.set_wrap(options.wrap());
     printer.set_execute(options.execute());
     printer.set_top_level(options.top_level());
     if (!options.test_function_name().empty()) {
       printer.set_test_function_name(options.test_function_name());
     }
 
     if (options.legacy_const()) i::FLAG_legacy_const = true;
     if (options.do_expressions()) i::FLAG_harmony_do_expressions = true;
 
-    stream << "#\n# Autogenerated by generate-bytecode-expectations\n#\n\n";
+    stream << "#\n# Autogenerated by generate-bytecode-expectations.\n#\n\n";
     options.PrintHeader(stream);
     for (const std::string& snippet : snippet_list) {
       printer.PrintExpectation(stream, snippet);
     }
   }
 }
 
 void PrintUsage(const char* exec_path) {
   std::cerr
       << "\nUsage: " << exec_path
@@ skipping 65 matching lines @@
       std::cerr << "ERROR: Could not open '" << options.output_filename()
                 << "' for writing.\n";
       return 3;
     }
   }
   std::ostream& output_stream =
       options.write_to_stdout() ? std::cout : output_file_handle;
 
   GenerateExpectationsFile(output_stream, snippet_list, options, argv[0]);
 }