[COMITTED] [PATCH] fix: Check if loop_vinfo is null before dereferencing [PR 126067]

[Alfie Richards]

Small fix for a bootstrap-O3 ICE. Sorry this one slipped me and my O2 bootstrap 
by.

Bootstrapped at O2, O3, and O3+LTO on aarch64, armhf, and x86_64

Pushing as obvious.

KR,
Alfie

-- >8 --

gcc/ChangeLog:

        * tree-vect-loop-manip.cc (vect_set_loop_condition_normal):
        Check if loop_vinfo is null before dereference.
---
 gcc/tree-vect-loop-manip.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/tree-vect-loop-manip.cc b/gcc/tree-vect-loop-manip.cc
index ff90a21c8dd..ec9dec1b713 100644
--- a/gcc/tree-vect-loop-manip.cc
+++ b/gcc/tree-vect-loop-manip.cc
@@ -1355,7 +1355,7 @@ vect_set_loop_condition_normal (loop_vec_info loop_vinfo, 
edge exit_edge,
   create_iv (init, PLUS_EXPR, step, NULL_TREE, loop,
             &incr_gsi, insert_after,
             &indx_before_incr, &indx_after_incr,
-            LOOP_VINFO_IV_INCREMENT_INVARIANT_P (loop_vinfo));
+            !loop_vinfo || LOOP_VINFO_IV_INCREMENT_INVARIANT_P (loop_vinfo));
 
   indx_after_incr = force_gimple_operand_gsi (&loop_cond_gsi, indx_after_incr,
                                              true, NULL_TREE, true,
-- 
2.34.1