[llvm] [AArch64] Set the cache line size to 64 for the V2 and V3. (PR #148213)

[Sjoerd Meijer via llvm-commits]

sjoerdmeijer wrote:

> 64 sounds good if this does something useful nowadays. It could probably be the default for all CPUs.

I think so too. The default of 0 doesn't make an awful lot of sense. 

https://github.com/llvm/llvm-project/pull/148213