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

[YunQiang Su via cfe-commits]

wzssyqa wrote:

Sorry for the late comment.
I find a problem.  With the IR code like
```
define dso_local float @f1(float noundef %a, float noundef %b) local_unnamed_addr #0 {
entry:
  %call = tail call float @llvm.minimumnum.f32(float noundef %a, float noundef %b) #2
  ret float %call
}
`./bin/llc --mtriple=mipsisa64r6-unknown-linux-gnuabin32 xx.ll` has `.section        .mdebug.abiN32,"", at progbits`, while
`./bin/llc --mtriple=mipsisa64r6-unknown-linux-muslabin32 xx.ll` has `.section        .mdebug.abi64,"", at progbits`

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