[Ada] Fix issues with ignored ghost code and unnesting

[Pierre-Marie de Rodat via Gcc-patches]

Unnesting needs to be run after all ignored ghost code is removed
so that it doesn't try to put entities into activation records that will
be removed. Also, don't add subprograms that are ignored into the list
of inlined subprograms.

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

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 --git a/gcc/ada/frontend.adb b/gcc/ada/frontend.adb
--- 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
--- 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;