[libc++] Add papers from February 2022 plenary meeting

Reviewed By: ldionne, Quuxplusone, #libc

Spies: arichardson, libcxx-commits

Differential Revision: https://reviews.llvm.org/D119189

NOKEYCHECK=True
GitOrigin-RevId: a5b4479d3c93bf0dca290db5ee40f35446758f65
diff --git a/docs/FeatureTestMacroTable.rst b/docs/FeatureTestMacroTable.rst
index 3cfcaa6..0991609 100644
--- a/docs/FeatureTestMacroTable.rst
+++ b/docs/FeatureTestMacroTable.rst
@@ -302,8 +302,12 @@
     ------------------------------------------------- -----------------
     ``__cpp_lib_associative_heterogeneous_erasure``   *unimplemented*
     ------------------------------------------------- -----------------
+    ``__cpp_lib_bind_back``                           *unimplemented*
+    ------------------------------------------------- -----------------
     ``__cpp_lib_byteswap``                            ``202110L``
     ------------------------------------------------- -----------------
+    ``__cpp_lib_constexpr_cmath``                     *unimplemented*
+    ------------------------------------------------- -----------------
     ``__cpp_lib_constexpr_typeinfo``                  *unimplemented*
     ------------------------------------------------- -----------------
     ``__cpp_lib_invoke_r``                            *unimplemented*
@@ -316,10 +320,24 @@
     ------------------------------------------------- -----------------
     ``__cpp_lib_out_ptr``                             *unimplemented*
     ------------------------------------------------- -----------------
+    ``__cpp_lib_ranges_chunk``                        *unimplemented*
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_ranges_chunk_by``                     *unimplemented*
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_ranges_iota``                         *unimplemented*
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_ranges_join_with``                    *unimplemented*
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_ranges_slide``                        *unimplemented*
+    ------------------------------------------------- -----------------
     ``__cpp_lib_ranges_starts_ends_with``             *unimplemented*
     ------------------------------------------------- -----------------
+    ``__cpp_lib_ranges_to_container``                 *unimplemented*
+    ------------------------------------------------- -----------------
     ``__cpp_lib_ranges_zip``                          *unimplemented*
     ------------------------------------------------- -----------------
+    ``__cpp_lib_reference_from_temporary``            *unimplemented*
+    ------------------------------------------------- -----------------
     ``__cpp_lib_spanstream``                          *unimplemented*
     ------------------------------------------------- -----------------
     ``__cpp_lib_stacktrace``                          *unimplemented*
@@ -331,5 +349,7 @@
     ``__cpp_lib_string_resize_and_overwrite``         ``202110L``
     ------------------------------------------------- -----------------
     ``__cpp_lib_to_underlying``                       ``202102L``
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_unreachable``                         *unimplemented*
     ================================================= =================