[llvm] [WIP][SPARC] Add TTI implementation for getting register numbers and widths (PR #180660)

[Nikita Popov via llvm-commits]

nikic wrote:

> Marking as WIP here since I'm a bit lost on how to write the test for this, given that the goal is to show that vectorization doesn't happen.

I think a LoopVectorize/Sparc test that was previously vectorized and isn't anymore after this change would be fine?

https://github.com/llvm/llvm-project/pull/180660