[RISCV] Add SiFiveP600Model SchedModel that is used by sifive-p670 (#84962)
This PR includes an initial scheduler model shows improvement on multiple workloads over NoSchedModel and SiFive7Model for sifive-p670. We plan on making significant changes to this model in the future so that it is more accurate. This patch would close https://github.com/llvm/llvm-project/pull/80612.
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