[COMMITTED] ada: Fix iterated component initialization

["Marc Poulhiès" <poulhies@adacore.com>]

The call to Resolve_Aggr_Expr may leave references to temporary entities
used to check for the construct legality and meant to be removed.

Using Preanalyze_And_Resolve correctly guarantees that there is no
visible occurrence of such entities.

gcc/ada/

	* sem_aggr.adb (Resolve_Iterated_Component_Association): Call
	Preanalyze_And_Resolve instead of Resolve_Aggr_Expr except for
	aggregate.

	Co-authored-by: Ed Schonberg <schonberg@adacore.com>

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

---
 gcc/ada/sem_aggr.adb | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/gcc/ada/sem_aggr.adb b/gcc/ada/sem_aggr.adb
index 3b2d0347b41..843606ab4a1 100644
--- a/gcc/ada/sem_aggr.adb
+++ b/gcc/ada/sem_aggr.adb
@@ -1862,9 +1862,14 @@ package body Sem_Aggr is
 
          Expr := Expression (N);
 
-         Expander_Mode_Save_And_Set (False);
-         Dummy := Resolve_Aggr_Expr (Expr, Single_Elmt => False);
-         Expander_Mode_Restore;
+         if Nkind (Expr) = N_Aggregate then
+            --  If the expression is an aggregate, this is a multidimensional
+            --  aggregate where the component type must be propagated downward.
+
+            Dummy := Resolve_Aggr_Expr (Expr, Single_Elmt => False);
+         else
+            Preanalyze_And_Resolve (Expr, Component_Typ);
+         end if;
 
          if Operating_Mode /= Check_Semantics then
             Remove_References (Expr);
-- 
2.40.0