[llvm] [AArch64] Enable maximize vector bandwidth for Neoverse-V1, V2 and N1 (PR #166748)

[Sjoerd Meijer via llvm-commits]

sjoerdmeijer wrote:

I wasn't aware of this TTI hook. But I agree it has a very promising name, and why wouldn't we want to set this? Did you run some perf numbers with this change? Can you share what improved?

https://github.com/llvm/llvm-project/pull/166748