Revert "Revert "Merge to upstream r304942.""

This reverts commit 38a0d5af7e.

Test: make checkbuild
Test: ./run_tests.py
Test: ./run_tests.py --bitness 64

test/std/containers/associative/set/insert_rv.pass.cpp

@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// UNSUPPORTED: c++98, c++03
+
 // <set>
 
 // class set
@@ -21,7 +23,6 @@
 
 int main()
 {
-#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     {
         typedef std::set<MoveOnly> M;
         typedef std::pair<M::iterator, bool> R;
@@ -50,7 +51,6 @@ int main()
         assert(m.size() == 3);
         assert(*r.first == 3);
     }
-#if TEST_STD_VER >= 11
     {
         typedef std::set<MoveOnly, std::less<MoveOnly>, min_allocator<MoveOnly>> M;
         typedef std::pair<M::iterator, bool> R;
@@ -79,6 +79,4 @@ int main()
         assert(m.size() == 3);
         assert(*r.first == 3);
     }
-#endif
-#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 }