[Ada] Make the Has_Dynamic_Range_Check flag obsolete

[Ada] Make the Has_Dynamic_Range_Check flag obsolete

2020-06-05  Eric Botcazou  <ebotcazou@adacore.com>

gcc/ada/

	* atree.adb (New_Copy): Clear Has_Dynamic_Range_Check on
	subexpression nodes.
	* checks.adb (Append_Range_Checks): Assert that the node
	doesn't have the Has_Dynamic_Range_Check flag set.
	(Insert_Range_Checks): Likewise.
	* exp_ch3.adb (Expand_N_Subtype_Indication): Do not apply
	range checks for a full type or object declaration.
	* sem_ch3.ads: Move with and use clauses for Nlists to...
	(Process_Range_Expr_In_Decl): Change default to No_List for
	the Check_List parameter.
	* sem_ch3.adb: ...here.
	(Process_Range_Expr_In_Decl): Likewise.  When the insertion
	node is a declaration, only insert on the list if is present
	when the declaration involves discriminants, and only insert
	on the node when there is no list otherwise.