[PATCH v1] RISC-V: Fix one range-loop-construct warning of avlprop

[pan2 . li]

From: Pan Li <pan2...@intel.com>

This patch would like to fix one warning of avlprop as below.

../../gcc/config/riscv/riscv-avlprop.cc: In member function 'virtual
unsigned int pass_avlprop::execute(function*)':
../../gcc/config/riscv/riscv-avlprop.cc:346:23: error: loop variable
'candidate' creates a copy from type 'const std::pair<avlprop_type,
rtl_ssa::insn_info*>' [-Werror=range-loop-construct]
  346 |       for (const auto candidate : m_candidates)
      |                       ^~~~~~~~~
../../gcc/config/riscv/riscv-avlprop.cc:346:23: note: use reference type
to prevent copying
  346 |       for (const auto candidate : m_candidates)
      |                       ^~~~~~~~~
      |                       &

gcc/ChangeLog:

        * config/riscv/riscv-avlprop.cc (pass_avlprop::execute): Use
        reference type to prevent copying.

Signed-off-by: Pan Li <pan2...@intel.com>
---
 gcc/config/riscv/riscv-avlprop.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/config/riscv/riscv-avlprop.cc 
b/gcc/config/riscv/riscv-avlprop.cc
index 2c79ec81806..c59eb7f6fa3 100644
--- a/gcc/config/riscv/riscv-avlprop.cc
+++ b/gcc/config/riscv/riscv-avlprop.cc
@@ -343,7 +343,7 @@ pass_avlprop::execute (function *fn)
     {
       fprintf (dump_file, "\nNumber of potential AVL propagations: %d\n",
               m_candidates.length ());
-      for (const auto candidate : m_candidates)
+      for (const auto &candidate : m_candidates)
        {
          fprintf (dump_file, "\nAVL propagation type: %s\n",
                   avlprop_type_to_str (candidate.first));
-- 
2.34.1