[llvm] [AArch64] Enable cmp + csel fusion for Neoverse V2 (PR #94309)

[Mingming Liu via llvm-commits]

minglotus-6 wrote:

Adding a few more reviewers from https://github.com/llvm/llvm-project/pull/90608

One colleague and I are planning to run some microbenchmarks (including https://github.com/google/fleetbench) and one internal service (with FDO on) to evaluate both `cmp + csel` and `cmp + bcc` (already tracked in https://github.com/llvm/llvm-project/pull/90608). Meanwhile, please let us know if there are known reasons that `cmp + csel` isn't enabled in the first place, thanks!

https://github.com/llvm/llvm-project/pull/94309