merge revision(s) 39444,39446: [Backport #7922]

	* compile.c (iseq_set_arguments): no keyword check if any keyword rest
	  argument exists, even unnamed.  [ruby-core:52744] [Bug #7922]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39670 b2dd03c8-39d4-4d8f-98ff-823fe69b080e