parse.y, vm_eval.c: file encoding in eval

* parse.y (yycompile): store file name as String to keep the encoding.

* parse.y (rb_parser_compile_string_path, rb_parser_compile_file_path):
  new functions to pass file name as a String.

* parse.y (gettable_gen): return a copy of the original file name, not
  a copy in filesystem encoding.

* vm_eval.c (eval_string_with_cref): use Qundef instead of "(eval)".

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42230 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
parse.y, vm_eval.c: file encoding in eval

* parse.y (yycompile): store file name as String to keep the encoding.
* parse.y (rb_parser_compile_string_path, rb_parser_compile_file_path):
  new functions to pass file name as a String.
* parse.y (gettable_gen): return a copy of the original file name, not
  a copy in filesystem encoding.
* vm_eval.c (eval_string_with_cref): use Qundef instead of "(eval)".

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42231 b2dd03c8-39d4-4d8f-98ff-823fe69b080e