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

[David Green via llvm-commits]

https://github.com/davemgreen approved this pull request.

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

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