[gcc(refs/users/marxin/heads/marxin-gcc-benchmark-branch)] Use const for template argument.

[Martin Liska]

https://gcc.gnu.org/g:03f9754665b889e0988d0392db1eb35e91b97693

commit 03f9754665b889e0988d0392db1eb35e91b97693
Author: Martin Liska <mliska@suse.cz>
Date:   Tue Feb 4 14:55:25 2020 +0100

    Use const for template argument.
    
    libstdc++-v3/ChangeLog:
    
    2020-02-04  Martin Liska  <mliska@suse.cz>
    
            PR c/92472
            * include/parallel/multiway_merge.h:
            Use const for _Compare template argument.

Diff:
---
 libstdc++-v3/include/parallel/multiway_merge.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/include/parallel/multiway_merge.h b/libstdc++-v3/include/parallel/multiway_merge.h
index 983c7b2bd9a..97a9ce0feb7 100644
--- a/libstdc++-v3/include/parallel/multiway_merge.h
+++ b/libstdc++-v3/include/parallel/multiway_merge.h
@@ -118,7 +118,7 @@ namespace __gnu_parallel
        *  @return @c true if less. */
       friend bool
       operator<(_GuardedIterator<_RAIter, _Compare>& __bi1,
-		_GuardedIterator<_RAIter, _Compare>& __bi2)
+		_GuardedIterator<_RAIter, const _Compare>& __bi2)
       {
 	if (__bi1._M_current == __bi1._M_end)       // __bi1 is sup
 	  return __bi2._M_current == __bi2._M_end;  // __bi2 is not sup
@@ -188,7 +188,7 @@ namespace __gnu_parallel
        *  @return @c true if less. */
       friend bool
       operator<(_UnguardedIterator<_RAIter, _Compare>& __bi1,
-		_UnguardedIterator<_RAIter, _Compare>& __bi2)
+		_UnguardedIterator<_RAIter, const _Compare>& __bi2)
       {
 	// Normal compare.
 	return (__bi1.__comp)(*__bi1, *__bi2);