[PATCH] D89025: [RISCV] Add -mtune support

[Kito Cheng via Phabricator via cfe-commits]

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- The goal of this patch is improve option compatible with RISCV-V GCC, -mcpu support on GCC side will sent patch in next few days.
- -mtune only affect the pipeline model and non-arch/extension related target feature, e.g. instruction fusion; in td file it called TuneFeatures, which is introduced by X86 back-end[1].
- -mtune accept all valid option for -mcpu and extra alias processor option, e.g. `generic`, `rocket` and `sifive-7-series`, the purpose is option compatible with RISCV-V GCC.
- Processor alias for -mtune will resolve according the current target arch, rv32 or rv64, e.g. `rocket` will resolve to `rocket-rv32` or `rocket-rv64`.
- Interaction between -mcpu and -mtune:
  - -mtune has higher priority than -mcpu for pipeline model and      TuneFeatures.

[1] https://reviews.llvm.org/D85165


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D89025

Files:
  clang/include/clang/Driver/Options.td
  clang/lib/Basic/Targets/RISCV.cpp
  clang/lib/Basic/Targets/RISCV.h
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/test/Driver/riscv-cpus.c
  clang/test/Misc/target-invalid-cpu-note.c
  llvm/include/llvm/Support/RISCVTargetParser.def
  llvm/include/llvm/Support/TargetParser.h
  llvm/lib/Support/TargetParser.cpp
  llvm/lib/Target/RISCV/RISCVAsmPrinter.cpp
  llvm/lib/Target/RISCV/RISCVSubtarget.cpp
  llvm/lib/Target/RISCV/RISCVSubtarget.h
  llvm/lib/Target/RISCV/RISCVTargetMachine.cpp

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