[Ada] Assertion_Policy (Ignore) ignores invariants

[Pierre-Marie de Rodat]

Previous check-in for this ticket was incomplete.  It did not properly
cover invariants inherited from one type to another.

Tested on x86_64-pc-linux-gnu, committed on trunk

2020-06-05  Bob Duff  <duff@adacore.com>

gcc/ada/

	* einfo.adb, einfo.ads, exp_util.adb: Remove Invariants_Ignored
	flag.
	* sem_prag.adb (Invariant): Instead of setting a flag to be
	checked elsewhere, remove the pragma as soon as it is analyzed
	and checked for legality.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: patch.diff
Type: text/x-diff
Size: 6455 bytes
Desc: not available
URL: <https://gcc.gnu.org/pipermail/gcc-patches/attachments/20200605/bd22bc15/attachment-0001.bin>