[gcc r12-7409] Simplify PRE fix

[Richard Biener]

https://gcc.gnu.org/g:800b3191c7506259a7452bde26b0b5ca3810c0cd

commit r12-7409-g800b3191c7506259a7452bde26b0b5ca3810c0cd
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Feb 28 12:21:19 2022 +0100

    Simplify PRE fix
    
    The following reverts a part of the PR103037 fix which is no longer necessary
    after the fix for PR104700.  That makes the possible cummulative backport
    smaller.
    
    2022-02-28  Richard Biener  <rguenther@suse.de>
    
            * tree-ssa-pre.cc (compute_avail): Revert part of last change.

Diff:
---
 gcc/tree-ssa-pre.cc | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/gcc/tree-ssa-pre.cc b/gcc/tree-ssa-pre.cc
index ca034ff7153..47d70c85c3c 100644
--- a/gcc/tree-ssa-pre.cc
+++ b/gcc/tree-ssa-pre.cc
@@ -3993,14 +3993,7 @@ compute_avail (function *fun)
 	  FOR_EACH_SSA_TREE_OPERAND (op, stmt, iter, SSA_OP_DEF)
 	    {
 	      pre_expr e = get_or_alloc_expr_for_name (op);
-	      unsigned value_id = get_expr_value_id (e);
-	      if (value_id_constant_p (value_id))
-		{
-		  get_or_alloc_expr_for_constant (VN_INFO (op)->valnum);
-		  continue;
-		}
-
-	      add_to_value (value_id, e);
+	      add_to_value (get_expr_value_id (e), e);
 	      bitmap_insert_into_set (TMP_GEN (block), e);
 	      bitmap_value_insert_into_set (AVAIL_OUT (block), e);
 	    }