[llvm] [llvm-mca][AArch64] Refactor Neoverse tests to split out common inputs (NFC) (PR #170324)

[Asher Dobrescu via llvm-commits]

https://github.com/Asher8118 commented:

 I think the change makes sense and I agree that a common source for testing is a good direction.
 
> I've been thru the entire diff and 99% of the time V1 makes more sense, except for a couple of small changes (might post a separate patch for).

One question, in the cases where we do have even slight divergence, what is the plan? Add those instructions specifically as a separate test to avoid duplication?

>The NEON and SVE tests are also quite substantial and could be made common, but there's also subtle differences that take time to go thru

I think as long as exceptions are handled as well, that would still be an improvement to the amount of duplication we currently have in tests.

https://github.com/llvm/llvm-project/pull/170324