[gcc(refs/users/aoliva/heads/strub)] silence warnings

[Alexandre Oliva]

https://gcc.gnu.org/g:5a02ae4a7f9d1eaac085a815519565be5865bb70

commit 5a02ae4a7f9d1eaac085a815519565be5865bb70
Author: Alexandre Oliva <oliva@gnu.org>
Date:   Thu Sep 2 23:15:40 2021 -0300

    silence warnings

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

diff --git a/gcc/optabs.c b/gcc/optabs.c
index ebed78fda3f..9b249106941 100644
--- a/gcc/optabs.c
+++ b/gcc/optabs.c
@@ -253,7 +253,7 @@ expand_widen_pattern_expr (sepops ops, rtx op0, rtx op1, rtx wide_op,
 			   rtx target, int unsignedp)
 {
   class expand_operand eops[4];
-  tree oprnd0, oprnd1, oprnd2;
+  tree oprnd0, oprnd1 = NULL_TREE, oprnd2 = NULL_TREE;
   machine_mode wmode = VOIDmode, tmode0, tmode1 = VOIDmode;
   optab widen_pattern_optab;
   enum insn_code icode;