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

[Craig Topper via llvm-commits]

topperc 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?

Goal was just to remove dimensions that should never be used. After the issue I found with reductions last week, I started auditing uses of TAIL_AGNOSTIC and TA_MA.

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