[libc++] Implement C++20's P0476R2: std::bit_cast
Thanks to Arthur O'Dwyer for fixing up some of the tests.
Differential Revision: https://reviews.llvm.org/D75960
NOKEYCHECK=True
GitOrigin-RevId: b1fb3d75c953fa2e02ebddb6ebbf100f99786f0c
diff --git a/docs/FeatureTestMacroTable.rst b/docs/FeatureTestMacroTable.rst
index c2690e7..68d2e3a 100644
--- a/docs/FeatureTestMacroTable.rst
+++ b/docs/FeatureTestMacroTable.rst
@@ -190,7 +190,7 @@
------------------------------------------------- -----------------
``__cpp_lib_bind_front`` ``201907L``
------------------------------------------------- -----------------
- ``__cpp_lib_bit_cast`` *unimplemented*
+ ``__cpp_lib_bit_cast`` ``201806L``
------------------------------------------------- -----------------
``__cpp_lib_bitops`` *unimplemented*
------------------------------------------------- -----------------