[gcc r12-3337] Do not release state location until after path registry.

[gcc r12-3337] Do not release state location until after path registry.

[Aldy Hernandez]

https://gcc.gnu.org/g:b237eb9dfdada49d3f2bdfa98aa4a0b67fc1829d

commit r12-3337-gb237eb9dfdada49d3f2bdfa98aa4a0b67fc1829d
Author: Aldy Hernandez <aldyh@redhat.com>
Date:   Fri Sep 3 10:11:28 2021 +0200

    Do not release state location until after path registry.
    
    We are popping state and then calling the registry code.  This causes
    the registry to have incorrect information.  This isn't visible in
    current trunk, but will be an issue when I submit further enhancements
    to the threading code.  However, it is a cleanup on its own so I am
    pushing it now.
    
    Tested on x86-64 Linux.
    
    gcc/ChangeLog:
    
            * tree-ssa-threadedge.c (jump_threader::thread_across_edge):
            Move pop until after a thread is registered.

Diff:
---
 gcc/tree-ssa-threadedge.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/tree-ssa-threadedge.c b/gcc/tree-ssa-threadedge.c
index 37ee5c11be3..8a485125ff5 100644
--- a/gcc/tree-ssa-threadedge.c
+++ b/gcc/tree-ssa-threadedge.c
@@ -1155,9 +1155,9 @@ jump_threader::thread_across_edge (edge e)
     {
       propagate_threaded_block_debug_into (path->last ()->e->dest,
 					   e->dest);
-      m_state->pop ();
       BITMAP_FREE (visited);
       m_registry->register_jump_thread (path);
+      m_state->pop ();
       return;
     }
   else