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

[Sjoerd Meijer via llvm-commits]

sjoerdmeijer wrote:

> A lot more vectorisation happens in Fortran SPEC FP benchmarks, particular fotonik3d, so if possible it might be good to check those too.

I have never done this before, but if it is just a matter of building flang I can certainly give this a try. 

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