[PATCH] D153742: [RISCV] Add Zce extension.

[Craig Topper via Phabricator via llvm-commits]

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According to the spec, Zce is an alias for Zca, Zcb, Zcmp, and Zcmt.
If F is enabled on RV32 it also includes Zcf.

This patch adds the Zce and the implication rule which unfortunately
requires custom handling for adding Zcf.

I've also made all the Zc* extensions imply Zca.

I've also added an error for Zcf without RV32.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D153742

Files:
  llvm/lib/Support/RISCVISAInfo.cpp
  llvm/lib/Target/RISCV/RISCVFeatures.td
  llvm/test/CodeGen/RISCV/attributes.ll
  llvm/test/MC/RISCV/attribute-arch.s
  llvm/test/MC/RISCV/rv32fc-valid.s
  llvm/unittests/Support/RISCVISAInfoTest.cpp

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