[clang] [llvm] [llvm][Triple] Add `Environment` members and parsing for glibc/musl parity. (PR #107664)

[Rich Felker via cfe-commits]

richfelker wrote:

If I understand this correctly, it's about GCC-style tuples, not the arch/subarch names musl uses for the ABI ldso name, etc. If that's correct, the only consideration is matching the GCC conventions and it's not really a matter governed by musl.


https://github.com/llvm/llvm-project/pull/107664