[gcc r12-5674] [Ada] Fix issues with ignored ghost code and unnesting

[Pierre-Marie de Rodat <pmderodat@gcc.gnu.org>]

https://gcc.gnu.org/g:be6bb3fc57e2af376e5c18eeca51119e87a55ee3

commit r12-5674-gbe6bb3fc57e2af376e5c18eeca51119e87a55ee3
Author: Richard Kenner <kenner@adacore.com>
Date:   Tue Nov 16 09:39:57 2021 -0500

    [Ada] Fix issues with ignored ghost code and unnesting
    
    gcc/ada/
    
            * frontend.adb (Frontend): Do unnesting after ignored ghost code
            has been removed.
            * inline.adb (Analyze_Inlined_Bodies): Don't put ignored ghost
            entities on inlined subprogram list.

Diff:
---
 gcc/ada/frontend.adb | 15 ++++++++-------
 gcc/ada/inline.adb   | 11 ++++++++---
 2 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/gcc/ada/frontend.adb b/gcc/ada/frontend.adb
index a65b3e1b410..b78fc9cf30d 100644
--- a/gcc/ada/frontend.adb
+++ b/gcc/ada/frontend.adb
@@ -473,12 +473,6 @@ begin
                Check_Elaboration_Scenarios;
             end if;
 
-            --  At this stage we can unnest subprogram bodies if required
-
-            if Total_Errors_Detected = 0 then
-               Exp_Unst.Unnest_Subprograms (Cunit (Main_Unit));
-            end if;
-
             --  List library units if requested
 
             if List_Units then
@@ -494,12 +488,19 @@ begin
             Sem_Warn.Output_Unused_Warnings_Off_Warnings;
 
             --  Remove any ignored Ghost code as it must not appear in the
-            --  executable. This action must be performed last because it
+            --  executable. This action must be performed very late because it
             --  heavily alters the tree.
 
             if Operating_Mode = Generate_Code or else GNATprove_Mode then
                Remove_Ignored_Ghost_Code;
             end if;
+
+            --  At this stage we can unnest subprogram bodies if required
+
+            if Total_Errors_Detected = 0 then
+               Exp_Unst.Unnest_Subprograms (Cunit (Main_Unit));
+            end if;
+
          end if;
       end if;
    end;
diff --git a/gcc/ada/inline.adb b/gcc/ada/inline.adb
index 08c454d366e..11a5523f4b7 100644
--- a/gcc/ada/inline.adb
+++ b/gcc/ada/inline.adb
@@ -1087,9 +1087,14 @@ package body Inline is
          --  subprograms for the unit.
 
          for Index in Inlined.First .. Inlined.Last loop
-            if Is_Called (Inlined.Table (Index).Name) then
-               Add_Inlined_Subprogram (Inlined.Table (Index).Name);
-            end if;
+            declare
+               E : constant Subprogram_Kind_Id := Inlined.Table (Index).Name;
+
+            begin
+               if Is_Called (E) and then not Is_Ignored_Ghost_Entity (E) then
+                  Add_Inlined_Subprogram (E);
+               end if;
+            end;
          end loop;
 
          Pop_Scope;