[PATCH] D158976: [RISCV] Add isCommutable for pseudos without merge operand

[Wang Pengcheng via Phabricator via llvm-commits]

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`vmadc` and vector mask-register logical instructions are commutable
and there is no merge operand for their pseudos.

We add `isCommutable=1` for these pseudos to gain more optimization
opportunities.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D158976

Files:
  llvm/lib/Target/RISCV/RISCVInstrInfoVPseudos.td
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vfcmp-constrained-sdnode.ll
  llvm/test/CodeGen/RISCV/rvv/vfcmp-constrained-sdnode.ll

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