[binutils-gdb] Give mapped_index_base a virtual destructor

[Tom Tromey <tromey@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=6555809e3e5ca516c7c1ffca494118ec7fd16934

commit 6555809e3e5ca516c7c1ffca494118ec7fd16934
Author: Tom Tromey <tom@tromey.com>
Date:   Mon Mar 29 17:44:57 2021 -0600

    Give mapped_index_base a virtual destructor
    
    This changes mapped_index_base to have a virtual destructor, so it can
    be destroyed via its base class.

Diff:
---
 gdb/dwarf2/mapped-index.h | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/gdb/dwarf2/mapped-index.h b/gdb/dwarf2/mapped-index.h
index c2ff27ac4f5..fb6828e43df 100644
--- a/gdb/dwarf2/mapped-index.h
+++ b/gdb/dwarf2/mapped-index.h
@@ -53,6 +53,7 @@ struct name_component
 struct mapped_index_base
 {
   mapped_index_base () = default;
+  virtual ~mapped_index_base() = default;
   DISABLE_COPY_AND_ASSIGN (mapped_index_base);
 
   /* The name_component table (a sorted vector).  See name_component's
@@ -88,10 +89,6 @@ struct mapped_index_base
     find_name_components_bounds (const lookup_name_info &ln_no_params,
 				 enum language lang,
 				 dwarf2_per_objfile *per_objfile) const;
-
-  /* Prevent deleting/destroying via a base class pointer.  */
-protected:
-  ~mapped_index_base() = default;
 };
 
 #endif /* GDB_DWARF2_MAPPED_INDEX_H */