[RFC] Populate seen_names hash in cooked_index_shard::do_finalize

[Tom Tromey <tromey@adacore.com>]

Hannes pointed out that cooked_index_shard::do_finalize never
populates the seen_names hash table.  This patch adds the necessary
store.  This reduces memory use a little for "gdb gdb":

(before) Space used: 28909568 (+0 for this command)
(after)  Space used: 28884992 (+0 for this command)

... about 24k.  So maybe it's better to just remove this hash?

What this means, btw, is that in gdb there are not many symbols that
are both mentioned in many CUs and that also require name
canonicalization.  It's possible this would differ in other programs.
---
 gdb/dwarf2/cooked-index.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gdb/dwarf2/cooked-index.c b/gdb/dwarf2/cooked-index.c
index 3d23a65ad8f..71852237f98 100644
--- a/gdb/dwarf2/cooked-index.c
+++ b/gdb/dwarf2/cooked-index.c
@@ -356,6 +356,7 @@ cooked_index_shard::do_finalize ()
 		  entry->canonical = canon_name.get ();
 		  m_names.push_back (std::move (canon_name));
 		}
+	      *slot = entry;
 	    }
 	  else
 	    {
-- 
2.39.1