[llvm] [AArch64] Disable Pre-RA Scheduler for Neoverse V2 (PR #127784)

[Sjoerd Meijer via llvm-commits]

sjoerdmeijer wrote:

Ah, now that https://github.com/llvm/llvm-project/pull/127620 was merged, I need to set this for Grace too. 

https://github.com/llvm/llvm-project/pull/127784