[llvm] [RISCV] Add GetVTypeMinimalPredicates for the operation supported by zvfhmin. NFC. (PR #143847)

[Craig Topper via llvm-commits]

topperc wrote:

FYI @tclin914 SiFive has patches for Zvfbfa internally. Should we provide those to upstream or have you already done the work yourself?

CC: @4vtomat 

https://github.com/llvm/llvm-project/pull/143847