Update Clang release note.

llvm · Oct 24, 2023 · 4ed116a · 4ed116a
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diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
@@ -643,6 +643,11 @@ X86 Support
 Arm and AArch64 Support
 ^^^^^^^^^^^^^^^^^^^^^^^
 
+- C++ function name mangling has been changed to align with the specification
+  (https://github.com/ARM-software/abi-aa/blob/main/aapcs64/aapcs64.rst).
+  This affects C++ functions with SVE ACLE parameters. Clang will use the old
+  manglings if ``-fclang-abi-compat=17`` or lower is  specified.
+
 Android Support
 ^^^^^^^^^^^^^^^