[llvm] [AArch64] set MaxInterleaveFactor to 4 for NeoverseV2 (PR #86631)

[David Green via llvm-commits]

https://github.com/davemgreen commented:

Whenever I have tried this in the past the performance has not looked great. Do you have results that suggest it does better? The problem is that many loops do not have a high enough trip count to make the larger loop body worth-while. Things could have changed recently with SVE and V2 though.

This would change the N2 too, which it probably shouldn't, and could do with having some sort of test.

https://github.com/llvm/llvm-project/pull/86631