* re.c (match_aref): RMatch::regexp is Qnil after matching by a
	  string since r45451.  [ruby-core:68209] [Bug #10877]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@49690 b2dd03c8-39d4-4d8f-98ff-823fe69b080e