[llvm] [ARM/Thumb] Mark TAILJMP*/TCRETURN* as using LR. (PR #73492)

[James Munns via llvm-commits]

jamesmunns wrote:

Hey @fhahn do you have somewhere else you are tracking this? I think we've seen this in Rust, with `-Oz` and `full lto` enabled, starting with LLVM17: https://github.com/rust-lang/rust/issues/118867

Does this match your understanding of the issue?

https://github.com/llvm/llvm-project/pull/73492