[libc++] Make __debug_less::operator() constexpr
This is a followup to [1] which added a new `__debug_less::operator()` overload.
[2] added `_LIBCPP_CONSTEXPR_AFTER_CXX17` to the original
`__debug_less::operator()` between the time of writing [1] and landing it. This
change adds `_LIBCPP_CONSTEXPR_AFTER_CXX17` to the new overload too.
[1] https://reviews.llvm.org/rL358423
[2] https://reviews.llvm.org/rL358252
Differential Revision: https://reviews.llvm.org/D60724
llvm-svn: 358725
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 6ab51de08e7c6b1dae8875bd5fb70354100e1116
diff --git a/include/algorithm b/include/algorithm
index 244ae2d..326e566 100644
--- a/include/algorithm
+++ b/include/algorithm
@@ -785,6 +785,7 @@
__debug_less(_Compare& __c) : __comp_(__c) {}
template <class _Tp, class _Up>
+ _LIBCPP_CONSTEXPR_AFTER_CXX17
bool operator()(const _Tp& __x, const _Up& __y)
{
bool __r = __comp_(__x, __y);