Extended Description

Summary: std::sort_heap use (possible deleted) operator, and failed to compile if it's deleted.

Steps to Reproduce: clang++ -o /dev/null -std=c++11 --compile test.cc
(test.cc attched)

Actual Results:
In file included from test.cc:1:
/home/yiyan/.local/bin/../include/c++/v1/algorithm:4998:67: error: overload resolution selected deleted operator ','
for (difference_type __n = __last - __first; __n > 1; --__last, --__n)
~~~~~~~~^ ~~~~~
/home/yiyan/.local/bin/../include/c++/v1/algorithm:5008:5: note: in instantiation of function template specialization 'std::__1::__sort_heap<std::__1::__less<int, int> &, random_access_iterator_wrapper >' requested here
__sort_heap<_Comp_ref>(__first, __last, __comp);
^
/home/yiyan/.local/bin/../include/c++/v1/algorithm:5016:12: note: in instantiation of function template specialization 'std::__1::sort_heap<random_access_iterator_wrapper, std::__1::__less<int, int> >' requested here
_VSTD::sort_heap(__first, __last, __less<typename iterator_traits<_RandomAccessIterator>::value_type>());
^
test.cc:33:10: note: in instantiation of function template specialization 'std::__1::sort_heap<random_access_iterator_wrapper >' requested here
std::sort_heap(sortcon.begin(), sortcon.end());
^
test.cc:23:10: note: candidate function [with U = long] has been explicitly deleted
void operator,(U) = delete;
^
1 error generated.

Expected Results: No error

Build Date & Hardware: Build 2019-08-20 on Linux x86_64