[gcc r14-107] Remove duplicate DFS walks from DF init

[Richard Biener <rguenth@gcc.gnu.org>]

https://gcc.gnu.org/g:974326fd5199a8ae8482f2a521b1edd449a2fa9e

commit r14-107-g974326fd5199a8ae8482f2a521b1edd449a2fa9e
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Feb 20 15:02:43 2023 +0100

    Remove duplicate DFS walks from DF init
    
    The following removes unused CFG order computes from
    rest_of_handle_df_initialize.  The CFG orders are computed from df_analyze ().
    This also removes code duplication that would have to be kept in sync.
    
            * df-core.cc (rest_of_handle_df_initialize): Remove
            computation of df->postorder, df->postorder_inverted and
            df->n_blocks.

Diff:
---
 gcc/df-core.cc | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/gcc/df-core.cc b/gcc/df-core.cc
index 3286ffda2ce..de5cbd0c622 100644
--- a/gcc/df-core.cc
+++ b/gcc/df-core.cc
@@ -701,11 +701,6 @@ rest_of_handle_df_initialize (void)
   if (optimize > 1)
     df_live_add_problem ();
 
-  df->postorder = XNEWVEC (int, last_basic_block_for_fn (cfun));
-  df->n_blocks = post_order_compute (df->postorder, true, true);
-  inverted_post_order_compute (&df->postorder_inverted);
-  gcc_assert ((unsigned) df->n_blocks == df->postorder_inverted.length ());
-
   df->hard_regs_live_count = XCNEWVEC (unsigned int, FIRST_PSEUDO_REGISTER);
 
   df_hard_reg_init ();