[llvm] [LAA] Prepare to handle diff type sizes (NFC) (PR #122318)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

I would be inclined to merge this, since the promised follow-ups are real improvements. @fhahn: if you have any objections, could you please raise them?

https://github.com/llvm/llvm-project/pull/122318