merge revision(s) 44354: [Backport #9270]

	* array.c: Have to_h raise on elements that are not key-value pairs
	  [#9239]

	* enum.c: ditto


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@44361 b2dd03c8-39d4-4d8f-98ff-823fe69b080e