[PATCH] D156590: [RISCV] Add a common base class for RVInstR variations. NFC

[Craig Topper via Phabricator via llvm-commits]

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We have multiple variations of InstrFormatR that pack different
fields into the upper 7 bits. The other 25 bits are all the same.

Add base class to capture this commonality and allow subclasses to
explicitly define Inst{31-25}.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D156590

Files:
  llvm/lib/Target/RISCV/RISCVInstrFormats.td
  llvm/lib/Target/RISCV/RISCVInstrInfoXCV.td
  llvm/lib/Target/RISCV/RISCVInstrInfoXTHead.td

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