[Interpreter] Refactor bytecode generator test suite.

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

Index: test/cctest/interpreter/generate-bytecode-expectations.cc
diff --git a/test/cctest/interpreter/generate-bytecode-expectations.cc b/test/cctest/interpreter/generate-bytecode-expectations.cc
index 567aa41a8eb5834eae8f14d81f74a4bae888ba38..db55a6cbabfe7e7cf7f2c6412fb1aa9a2d46d3a3 100644
--- a/test/cctest/interpreter/generate-bytecode-expectations.cc
+++ b/test/cctest/interpreter/generate-bytecode-expectations.cc
@@ -381,7 +381,7 @@ void GenerateExpectationsFile(std::ostream& stream,  // NOLINT
     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);