The table has been unused for a while.  No functional changes.

2019-08-14  Eric Botcazou  <ebotcazou@adacore.com>

gcc/ada/

	* inline.ads (Pending_Descriptor): Delete.
	* inline.adb (Initialize): Do not initialize it.
	* sem_ch12.adb (Delay_Descriptors): Delete.
	(Analyze_Package_Instantiation): Call
	Set_Delay_Subprogram_Descriptors instead of Delay_Descriptors
	throughout.

From-SVN: r274459