[llvm] [ARM] Refactor ARMFrameLowering (NFC) (PR #110283)

[Oliver Stannard via llvm-commits]

ostannard wrote:

Committed as:
* 754c1f21700d7f6df3ee3bf86769c59cce1a6cfd
* e817cfde41e661886538d7991c8fcf4164b98ee3
* 2ecf2e242b5e4c808fc3f6f2230d2f68b9ee1004
* 67200f5dc8a662edd05928f97940c2fcabf42043
* baa1fc9825ca29a81f98146da6036e3415182f16


https://github.com/llvm/llvm-project/pull/110283