[PATCH] D94403: [RISCV] Implement new architecture extension macros

[Simon Cook via Phabricator via cfe-commits]

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This adds support for the new architecture extension test macros as
defined in the C-API Document:
https://github.com/riscv/riscv-c-api-doc/blob/master/riscv-c-api.md

Extension versions have been taken from what are used in
RISCVTargetStreamer for ratified extensions, and the -march parser
for experimental extensions.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D94403

Files:
  clang/lib/Basic/Targets/RISCV.cpp
  clang/test/Preprocessor/riscv-target-features.c

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