[gcc r10-10121] Fix inaccurate bounds in debug info for vector array types

[Eric Botcazou <ebotcazou@gcc.gnu.org>]

https://gcc.gnu.org/g:1f17aab16b06846b2911179b0206fc2801cc0f47

commit r10-10121-g1f17aab16b06846b2911179b0206fc2801cc0f47
Author: Eric Botcazou <ebotcazou@adacore.com>
Date:   Tue Sep 14 11:10:17 2021 +0200

    Fix inaccurate bounds in debug info for vector array types
    
    They should not be 0-based, unless the array type itself is.
    
    gcc/ada/
            * gcc-interface/decl.c (gnat_to_gnu_entity): For vector types, make
            the representative array the debug type.

Diff:
---
 gcc/ada/gcc-interface/decl.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/gcc/ada/gcc-interface/decl.c b/gcc/ada/gcc-interface/decl.c
index efbcf70eadc..80107a69060 100644
--- a/gcc/ada/gcc-interface/decl.c
+++ b/gcc/ada/gcc-interface/decl.c
@@ -4707,6 +4707,14 @@ gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, bool definition)
       else
 	gnu_decl = create_type_decl (gnu_entity_name, gnu_type, artificial_p,
 				     debug_info_p, gnat_entity);
+
+      /* For vector types, make the representative array the debug type.  */
+      if (VECTOR_TYPE_P (gnu_type))
+	{
+	  tree rep = TYPE_REPRESENTATIVE_ARRAY (gnu_type);
+	  TYPE_NAME (rep) = DECL_NAME (gnu_decl);
+	  SET_TYPE_DEBUG_TYPE (gnu_type, rep);
+	}
     }
 
   /* Otherwise, for a type reusing an existing DECL, back-annotate values.  */