This patch modifies the generation of task deallocation code to examine
the underlying type for task components.

2019-07-05  Hristian Kirtchev  <kirtchev@adacore.com>

gcc/ada/

	* exp_ch7.adb (Cleanup_Record): Use the underlying type when
	checking for components with tasks.

gcc/testsuite/

	* gnat.dg/task3.adb, gnat.dg/task3.ads, gnat.dg/task3_pkg1.ads,
	gnat.dg/task3_pkg2.ads: New testcase.

From-SVN: r273121