[gcc r13-7410] release the sorted FDE array when deregistering a frame [PR109685]

[gcc r13-7410] release the sorted FDE array when deregistering a frame [PR109685]

[Thomas Neumann]

https://gcc.gnu.org/g:fd68f60c4ca5d23e4f42c447a2fd1d33030301bf

commit r13-7410-gfd68f60c4ca5d23e4f42c447a2fd1d33030301bf
Author: Thomas Neumann <tneumann@users.sourceforge.net>
Date:   Tue May 2 16:21:09 2023 +0200

    release the sorted FDE array when deregistering a frame [PR109685]
    
    The atomic fastpath bypasses the code that releases the sort
    array which was lazily allocated during unwinding. We now
    check after deregistering if there is an array to free.
    
    libgcc/ChangeLog:
            PR libgcc/109685
            * unwind-dw2-fde.c: Free sort array in atomic fast path.

Diff:
---
 libgcc/unwind-dw2-fde.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libgcc/unwind-dw2-fde.c b/libgcc/unwind-dw2-fde.c
index a5786bf729c..32b9e64a1c8 100644
--- a/libgcc/unwind-dw2-fde.c
+++ b/libgcc/unwind-dw2-fde.c
@@ -241,6 +241,12 @@ __deregister_frame_info_bases (const void *begin)
   // And remove
   ob = btree_remove (&registered_frames, range[0]);
   bool empty_table = (range[1] - range[0]) == 0;
+
+  // Deallocate the sort array if any.
+  if (ob && ob->s.b.sorted)
+    {
+      free (ob->u.sort);
+    }
 #else
   init_object_mutex_once ();
   __gthread_mutex_lock (&object_mutex);