[PATCH] D136817: [RISCV] Add H extension

[Kito Cheng via Phabricator via llvm-commits]

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`h` was the prefix of multi-letter extension name, but it become a
extension name in later RISC-V isa spec.

Fortunately we don't have any extension really defined is prefixed
with `h`, so we can just change that.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D136817

Files:
  clang/test/Preprocessor/riscv-target-features.c
  llvm/docs/RISCVUsage.rst
  llvm/lib/Support/RISCVISAInfo.cpp
  llvm/lib/Target/RISCV/RISCV.td
  llvm/lib/Target/RISCV/RISCVSubtarget.h
  llvm/test/CodeGen/RISCV/attributes.ll

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