[libc++] Implements constexpr <charconv>.
Implements:
- P2291R3 Add Constexpr Modifiers to Functions to_chars and from_chars for
Integral Types in <charconv> Header
Reviewed By: #libc, ldionne
Differential Revision: https://reviews.llvm.org/D131317
NOKEYCHECK=True
GitOrigin-RevId: a1e13a80d06c2d1764ab573df06a3b903f134703
diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
index 6a8c61b..7befa46 100644
--- a/docs/ReleaseNotes.rst
+++ b/docs/ReleaseNotes.rst
@@ -42,6 +42,8 @@
- P2445R1 - ``std::forward_like``
- P2273R3 - Making ``std::unique_ptr`` constexpr
- P0591R4 - Utility functions to implement uses-allocator construction
+- P2291R3 - Add Constexpr Modifiers to Functions ``to_chars`` and
+ ``from_chars`` for Integral Types in ``<charconv>`` Header
Improvements and New Features
-----------------------------