Backport from mainline
	2014-11-20  Vincent Celier  <celier@adacore.com>

	PR ada/47500
	* back_end.adb (Scan_Back_End_Switches): Skip switch -G and
	its argument.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_9-branch@217962 138bc75d-0d04-0410-961f-82ee72b054a4