[PATCH] D117889: [RISCV][RFC] add support for zbkx subextension.

[Zircon Liu via Phabricator via llvm-commits]

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This patch adds support for zbkx extension from K extension(v1.0.0) in MC layer.
Instructions with same functionality and same encoding is defined in the bitmanip extension. However these instructions, specifically
xperm.*, along with Zbp extension itself, are removed in the latest version. Hence a cleanup of previous codes is probably needs.
This patch doesn't clean these outdated codes. Now it defines a new decoder space to avoid collision. It needs further discussion to
determine what to do.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D117889

Files:
  llvm/lib/Support/RISCVISAInfo.cpp
  llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
  llvm/lib/Target/RISCV/RISCV.td
  llvm/lib/Target/RISCV/RISCVInstrInfo.td
  llvm/lib/Target/RISCV/RISCVInstrInfoZk.td
  llvm/lib/Target/RISCV/RISCVSchedRocket.td
  llvm/lib/Target/RISCV/RISCVSchedSiFive7.td
  llvm/lib/Target/RISCV/RISCVSubtarget.h
  llvm/test/CodeGen/RISCV/attributes.ll
  llvm/test/MC/RISCV/attribute-arch.s
  llvm/test/MC/RISCV/rv32zbkx-valid.s

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