[PATCH] D138352: [RISCV] Support .variant_cc directive for the assembler.

[Yeting Kuo via Phabricator via llvm-commits]

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The patch is split from D103435 <https://reviews.llvm.org/D103435>. The patch supported a new directive .variant_cc
that annotates function with STO_RISCV_VARIANT_CC. Symbols marked with
STO_RISCV_VARIANT_CC do not use standard calling conversion or use parameter not
passed in GPR/FPR.

Related: https://github.com/riscv/riscv-elf-psabi-doc/pull/190

Initial authored by: HsiangKai


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D138352

Files:
  llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
  llvm/lib/Target/RISCV/MCTargetDesc/RISCVELFStreamer.cpp
  llvm/lib/Target/RISCV/MCTargetDesc/RISCVELFStreamer.h
  llvm/lib/Target/RISCV/MCTargetDesc/RISCVTargetStreamer.cpp
  llvm/lib/Target/RISCV/MCTargetDesc/RISCVTargetStreamer.h
  llvm/test/MC/RISCV/directive-variant_cc-err.s
  llvm/test/MC/RISCV/directive-variant_cc.s

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