Add constexpr to pair
Reviewed By: #libc, ldionne
Differential Revision: https://reviews.llvm.org/D80558
diff --git a/libcxx/docs/FeatureTestMacroTable.rst b/libcxx/docs/FeatureTestMacroTable.rst
index a6867fb..1dbeb21 100644
--- a/libcxx/docs/FeatureTestMacroTable.rst
+++ b/libcxx/docs/FeatureTestMacroTable.rst
@@ -184,6 +184,8 @@
------------------------------------------------- -----------------
``__cpp_lib_constexpr_swap_algorithms`` *unimplemented*
------------------------------------------------- -----------------
+ ``__cpp_lib_constexpr_utility `` ``201811L``
+ ------------------------------------------------- -----------------
``__cpp_lib_destroying_delete`` ``201806L``
------------------------------------------------- -----------------
``__cpp_lib_endian`` ``201907L``