[PATCH] D142685: [LoongArch] Implement handling of triple-implied ABIs

[WÁNG Xuěruì via Phabricator via llvm-commits]

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According to the LoongArch Toolchain Conventions <https://loongson.github.io/LoongArch-Documentation/LoongArch-toolchain-conventions-EN.html>
it is possible to specify the ABI modifier (the "D" part of "LP64D")
via the environment field in the target triple. This is needed for
proper support for Debian-style multiarch tuples as well, so add triple
awareness to `LoongArchSubtarget` via addition of
`LoongArchABI::computeTargetABI`. Let the explicit `--target-abi`
argument intuitively take precedence over the triple-implied ABI.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D142685

Files:
  llvm/lib/Target/LoongArch/LoongArchSubtarget.cpp
  llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchBaseInfo.cpp
  llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchBaseInfo.h
  llvm/test/CodeGen/LoongArch/target-abi-from-triple.ll

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