[llvm] [LLVM][ARM][CodeGen]Define branch instruction alignment for m85 and m7 (PR #109647)

[David Green via llvm-commits]

https://github.com/davemgreen approved this pull request.

I think this sounds OK. LGTM

(We should maybe be renaming FeaturePrefLoopAlign if it aligns both functions and loops).

https://github.com/llvm/llvm-project/pull/109647