[COMMITTED] ada: Fix ghost policy in use for generic instantiation

[COMMITTED] ada: Fix ghost policy in use for generic instantiation

[Marc Poulhiès]

From: Yannick Moy <moy@adacore.com>

The Ghost assertion policy relevant for analyzing a generic instantiation
is the Ghost policy at the point of instantiation, not the one applicable
for the generic itself.

gcc/ada/

	* ghost.adb (Mark_And_Set_Ghost_Instantiation): Fix the current
	Ghost policy for the instantiation.

Tested on x86_64-pc-linux-gnu, committed on master.

---
 gcc/ada/ghost.adb | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/gcc/ada/ghost.adb b/gcc/ada/ghost.adb
index 14951a031d9..677089039e8 100644
--- a/gcc/ada/ghost.adb
+++ b/gcc/ada/ghost.adb
@@ -1734,13 +1734,17 @@ package body Ghost is
       elsif Ghost_Mode = Ignore then
          Policy := Name_Ignore;
 
-      --  Inherit the "ghostness" of the generic unit
+      --  Inherit the "ghostness" of the generic unit, but the current Ghost
+      --  policy is the relevant one for the instantiation.
 
-      elsif Is_Checked_Ghost_Entity (Gen_Id) then
-         Policy := Name_Check;
+      elsif Is_Checked_Ghost_Entity (Gen_Id)
+        or else Is_Ignored_Ghost_Entity (Gen_Id)
+      then
+         Policy := Policy_In_Effect (Name_Ghost);
 
-      elsif Is_Ignored_Ghost_Entity (Gen_Id) then
-         Policy := Name_Ignore;
+         if Policy = No_Name then
+            Policy := Name_Ignore;
+         end if;
       end if;
 
       --  Mark the instantiation as Ghost
-- 
2.43.2