[gcc r12-2953] retain debug stmt order when moving to successors

[Alexandre Oliva <aoliva@gcc.gnu.org>]

https://gcc.gnu.org/g:6bcbf80c6e2bd8a60d88bbcac3d70ffb67f4888f

commit r12-2953-g6bcbf80c6e2bd8a60d88bbcac3d70ffb67f4888f
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Sat Jul 24 23:05:33 2021 -0300

    retain debug stmt order when moving to successors
    
    We iterate over debug stmts from the last one in new_bb, and we insert
    them before the first post-label stmt in each dest block, without
    moving the insertion iterator, so they end up reversed.  Moving the
    insertion iterator fixes this.
    
    
    for  gcc/ChangeLog
    
            * tree-inline.c (maybe_move_debug_stmts_to_successors): Don't
            reverse debug stmts.

Diff:
---
 gcc/tree-inline.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/tree-inline.c b/gcc/tree-inline.c
index c5d6b1e6489..5955ff18fdb 100644
--- a/gcc/tree-inline.c
+++ b/gcc/tree-inline.c
@@ -2880,7 +2880,7 @@ maybe_move_debug_stmts_to_successors (copy_body_data *id, basic_block new_bb)
 		  gimple_set_location (stmt, UNKNOWN_LOCATION);
 		}
 	      gsi_remove (&si, false);
-	      gsi_insert_before (&dsi, stmt, GSI_SAME_STMT);
+	      gsi_insert_before (&dsi, stmt, GSI_NEW_STMT);
 	      continue;
 	    }
 
@@ -2906,7 +2906,7 @@ maybe_move_debug_stmts_to_successors (copy_body_data *id, basic_block new_bb)
 	    new_stmt = as_a <gdebug *> (gimple_copy (stmt));
 	  else
 	    gcc_unreachable ();
-	  gsi_insert_before (&dsi, new_stmt, GSI_SAME_STMT);
+	  gsi_insert_before (&dsi, new_stmt, GSI_NEW_STMT);
 	  id->debug_stmts.safe_push (new_stmt);
 	  gsi_prev (&ssi);
 	}