[llvm] [ARM] Fix -mno-omit-leaf-frame-pointer flag doesn't works on 32-bit ARM (PR #109628)

[David Spickett via llvm-commits]

DavidSpickett wrote:

>Please add a release note to llvm/docs/ReleaseNotes.rst and clang/docs/ReleaseNotes.rst.

LLVM is `.md` (Markdown) now but same folder still: https://github.com/llvm/llvm-project/blob/main/llvm/docs/ReleaseNotes.md

https://github.com/llvm/llvm-project/pull/109628