[clang] [llvm] [RISCV] Support Zvfbfa codegen and C intrinsics (PR #161158)

[Craig Topper via cfe-commits]

https://github.com/topperc requested changes to this pull request.

This crashes commuting FMA instructions. We need to update findCommutedOpIndices and commuteInstructionImpl

https://github.com/llvm/llvm-project/pull/161158