[llvm] [RISCV] Use policy instead of ForceTailAgnostic for vmsbf/vmsif/vmsof pseudos. (PR #127535)

[Luke Lau via llvm-commits]

https://github.com/lukel97 approved this pull request.

LGTM. I don't think there's much point keeping around the TSFlag/optimisation in RISCVInsertVSETVLI if none of the intrinsics can manually set the policy.

https://github.com/llvm/llvm-project/pull/127535