This can reduce some vsetvli toggles.
This can be done in pre-ra scheduling as we have moved insertion of
vsetvli after the first RA.
Currently, we override `tryCandidate` and add a new heuristic based
on comparison of `vtype`/`vl`.
Reviewers: asb, preames, topperc, lukel97, mshockwave, BeMg
Reviewed By: mshockwave, lukel97
Pull Request: https://github.com/llvm/llvm-project/pull/95924
Currently we do nothing RISC-V specific in this scheduler.
This is a part of vtype-based scheduling.
Reviewers: BeMg, mshockwave, lukel97, preames, topperc
Pull Request: https://github.com/llvm/llvm-project/pull/172613
