2019-12-16  Bob Duff  <duff@adacore.com>

gcc/ada/

	* par.adb: Add Scopes function to do range checking on the scope
	stack.  Call Scopes all over the parser.  Add
	SIS_Aspect_Import_Seen flag.
	* par-ch6.adb (P_Subprogram): Initialize SIS_Aspect_Import_Seen
	to False at the start, and check it at the end.
	* par-ch13.adb (Get_Aspect_Specifications): Set
	SIS_Aspect_Import_Seen to True when appropriate.
	* par-ch10.adb, par-ch12.adb, par-ch2.adb, par-ch3.adb,
	par-ch5.adb, par-ch7.adb, par-ch9.adb, par-endh.adb,
	par-util.adb: Call Scopes.

From-SVN: r279428