2019-12-16  Arnaud Charlet  <charlet@adacore.com>

gcc/ada/

	* libgnat/s-aotase.adb, libgnat/s-aotase.ads,
	libgnat/s-atoope.ads, libgnat/s-atopar.adb,
	libgnat/s-atopar.ads, libgnat/s-atopex.adb,
	libgnat/s-atopex.ads: New files.
	* libgnat/s-atopri.ads: Add new intrinsics.
	* Makefile.rtl: Add new runtime files.
	* impunit.adb: Add new units to Ada 2020 list.

From-SVN: r279434