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

[Pengcheng Wang via llvm-commits]

wangpc-pp wrote:

This PR will only enable bidirectional scheduling and tracking register pressure. And `ShouldTrackLaneMasks`/`DisableLatencyHeuristic` will be follow-ups (need more inputs).

I will land this in a few days if there is no further more discusstion.

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