[PATCH] D130272: [Support] Handle SPARC in sys::getHostCPUName

[Rainer Orth via Phabricator via llvm-commits]

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While working on D118450 <https://reviews.llvm.org/D118450>, I noticed that `sys::getHostCPUName` lacks SPARC support.

This patch implements it.  The code is taken from/inspired by GCC's `gcc/config/sparc/driver-sparc.cc`.  There's one caveat: since LLVM, unlike GCC, doesn't support the SPARC-M7, -S7, and -M8 CPUs, I map all those to the latest supported one (UltraSparc T5/`niagara4`).

Tested on `sparcv9-sun-solaris2.11` and `sparc64-unknown-linux-gnu` by running `savcov --version` on

- Netra SPARC S7-2 (SPARC-S7, Solaris 11.4)
- SPARC T5-2 (SPARC T5, Solaris 11.4)
- SPARC Enterprise T5220 (UltraSPARC T2, Solaris 11.3)
- SPARC T5 (UltraSPARC T5, Debian sid)
- SPARC T3 (UltraSPARC T3, Debian sid)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D130272

Files:
  llvm/include/llvm/Support/Host.h
  llvm/lib/Support/CMakeLists.txt
  llvm/lib/Support/Host.cpp

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