merge revision(s) r46569: [Backport #9982]

	* sprintf.c (GETASTER): should not use the numbered argument to be
	  formatted, raise ArgumentError instead.
	  [ruby-dev:48330] [Bug #9982]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@47376 b2dd03c8-39d4-4d8f-98ff-823fe69b080e