merge revision(s) r45562: [Backport #9727]

	* array.c (ary_reject): may be turned into a shared array during
	  the given block.  [ruby-dev:48101] [Bug #9727]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@46188 b2dd03c8-39d4-4d8f-98ff-823fe69b080e