[Ada] Ignore subprogram address in ownership checking

[Ada] Ignore subprogram address in ownership checking

Ownership checking done as in GNATprove should ignore address of
subprograms, as it applies only on objects. Now fixed.

There is no impact on compilation.

2019-08-21  Yannick Moy  <moy@adacore.com>

gcc/ada/

	* sem_spark.adb (Process_Path): Do nothing on address of
	subprogram.

From-SVN: r274779