[PATCH] D117308: [RISCV] Add CSRs defined in the recently ratified Sscofpmf extension

[Alex Bradbury via Phabricator via llvm-commits]

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The "RISC-V Count Overflow and Mode-Based Filtering Extension" was
ratified at the end of last year though hasn't yet been integrated in
the main specification documents (see
https://wiki.riscv.org/display/TECH/Recently+Ratified+Extensions).

This commit adds the CSRs defined by this extension in
https://github.com/riscv/riscv-count-overflow/releases/download/v0.5.2/Sscofpmf.pdf.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D117308

Files:
  llvm/lib/Target/RISCV/RISCVSystemOperands.td
  llvm/test/MC/RISCV/rv32-machine-csr-names.s
  llvm/test/MC/RISCV/rv32-only-csr-names.s
  llvm/test/MC/RISCV/supervisor-csr-names.s

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