[llvm] [RISCV] Override default sched policy (PR #115445)

[Alex Bradbury via llvm-commits]

asb wrote:

Good spot! I just wonder about ShouldTrackLaneMasks and whether that might make sense as a rather than being enabled at first. It looks like of the in-tree targets, only AMDGPU is enabling it right now. Not a strong view though, so if you've delved into how it's used and put a reasonable amount of code through it I wouldn't object leaving it as-is.

https://github.com/llvm/llvm-project/pull/115445