[PATCH] D142833: [RISCV] Move FRM parsing in the assembler to a custom operand parser.

[Craig Topper via Phabricator via llvm-commits]

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Previously we parsed it as a symbol, and then accessed the name.
This works, but seems like an unusual way to do it.

This adds a custom parser that looks for an Identifier token containing
one of the valid FRM strings.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D142833

Files:
  llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
  llvm/lib/Target/RISCV/RISCVInstrInfoF.td

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