[libc++][ranges] Implement P1899 ranges::stride_view.

libcxx/docs/FeatureTestMacroTable.rst

@@ -384,6 +384,8 @@ Status
     ---------------------------------------------------------- -----------------
     ``__cpp_lib_ranges_starts_ends_with``                      ``202106L``
     ---------------------------------------------------------- -----------------
+    ``__cpp_lib_ranges_stride``                                ``202207L``
+    ---------------------------------------------------------- -----------------
     ``__cpp_lib_ranges_to_container``                          ``202202L``
     ---------------------------------------------------------- -----------------
     ``__cpp_lib_ranges_zip``                                   *unimplemented*

libcxx/docs/ReleaseNotes/20.rst

@@ -47,6 +47,7 @@ Implemented Papers
 - ``std::jthread`` and ``<stop_token>`` are not guarded behind ``-fexperimental-library`` anymore
 - P2674R1: A trait for implicit lifetime types (`Github <https://github.com/llvm/llvm-project/issues/105259>`__)
 - P0429R9: A Standard ``flat_map`` (`Github <https://github.com/llvm/llvm-project/issues/105190>`__)
+- P1899: ``stride_view`` (`Github <https://github.com/llvm/llvm-project/issues/105198>` __)
 
 Improvements and New Features
 -----------------------------

libcxx/include/CMakeLists.txt

@@ -719,6 +719,7 @@ set(files
   __ranges/single_view.h
   __ranges/size.h
   __ranges/split_view.h
+  __ranges/stride_view.h
   __ranges/subrange.h
   __ranges/take_view.h
   __ranges/take_while_view.h