test_keyword.rb: suppress warnings

* test/ruby/test_keyword.rb (test_block_required_keyword): suppress
  shadowing outer variable warning.

* test/ruby/test_keyword.rb (test_precedence_of_keyword_arguments):
  suppress unused variable warning.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44419 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
compile.c: unnamed keyword rest check

* compile.c (iseq_set_arguments): set arg_keyword_check from
  nd_cflag, which is set by parser.  internal ID is used for
  unnamed keyword rest argument, which should be separated from no
  keyword check.
* iseq.c (rb_iseq_parameters): if no keyword check, keyword rest is
  present.
* parse.y (new_args_tail_gen): set keywords check to nd_cflag, which
  equals to that keyword rest is not present.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44420 b2dd03c8-39d4-4d8f-98ff-823fe69b080e