* snames.ads-tmpl (Name_Ivdep): New pragma-related name.
	* sem_prag.adb (Analyze_Pragma) <Pragma_Loop_Optimize>: Add support
	for Ivdep hint.
	* gnat_rm.texi (Implementation Defined Pragmas): Document new Ivdep
	hint for Loop_Optimize.
	* gnat_ugn.texi (Vectorization of loops): Mention new Ivdep hint.
	* gcc-interface/trans.c (Pragma_to_gnu) <Pragma_Loop_Optimize>: Deal
	with new Ivdep hint.
	* gcc-interface/ada-tree.h (LOOP_STMT_IVDEP): New macro.
	* gcc-interface/trans.c (Pragma_to_gnu) <Pragma_Loop_Optimize>: Deal
	with new Ivdep hint.
	(gnat_gimplify_stmt) <LOOP_STMT>: Propagate the loop hints.

From-SVN: r209375