[PATCH] middle-end: Fix unexpected warnings for RISC-V port.

[juzhe . zhong]

From: zhongjuzhe <juzhe.zh...@rivai.ai>

gcc/ChangeLog:

        * tree-vect-loop-manip.cc (vect_gen_vector_loop_niters): Simply 
initialize const_vf to 0.

---
 gcc/tree-vect-loop-manip.cc | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/gcc/tree-vect-loop-manip.cc b/gcc/tree-vect-loop-manip.cc
index 86d2264054a..c3a24e6c39a 100644
--- a/gcc/tree-vect-loop-manip.cc
+++ b/gcc/tree-vect-loop-manip.cc
@@ -1977,8 +1977,9 @@ vect_gen_vector_loop_niters (loop_vec_info loop_vinfo, 
tree niters,
     }
   else
     ni_minus_gap = niters;
-
-  unsigned HOST_WIDE_INT const_vf;
+  
+  /* To silence some unexpected warnings, simply initialize to 0. */
+  unsigned HOST_WIDE_INT const_vf = 0;
   if (vf.is_constant (&const_vf)
       && !LOOP_VINFO_USING_PARTIAL_VECTORS_P (loop_vinfo))
     {
-- 
2.36.1