[llvm] [AArch64] Set MaxInterleaving to 4 for Neoverse V2 (PR #100385)

[Julian Nagele via llvm-commits]

juliannagele wrote:

> > One issue with interleaving is that epilogue vecotrizaiton only considers VF, but not VF x UF. There are a number of cases where epilogue vectorization would be beneficial on AArch64 when the VF < 16 but UF > 1. @juliannagele is currently looking into adjusting the cost model for that.
> 
> I hadn't realised that we didn't account for the UF already. That sounds like a good thing to fix, thanks for the info. @juliannagele @fhahn do you have a timeframe for when such a patch will be ready?

Hi, I've got an initial version of this ready, I'll clean it up a bit and share a draft tomorrow

https://github.com/llvm/llvm-project/pull/100385