[llvm] [RISCV] Remove policy and merge operand from unmasked vmsbf/vmsif/vmsof.m. (PR #94530)

[Philip Reames via llvm-commits]

preames wrote:

Why bother?  Given we need the masked variants which do have a mask policy, what do we gain by having distinct pseudo shapes between unmasked and masked?  Is the goal to exploit the don't care on the tail policy?  If so, then why not do that directly so that the masked variants benefit as well?

https://github.com/llvm/llvm-project/pull/94530