[PATCH] D156589: [RISCV] Add a common base class for RVInstI variations. NFC

[Craig Topper via Phabricator via llvm-commits]

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We have multiple variations of InstrFormatI that pack different
fields into the upper 12 bits. The other 20 bits are all the same.

Add base class to capture this commonality and allow subclasses to
explicitly define Inst{31-20}.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D156589

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

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