[llvm] [SelectionDAG][Test] Temporarily disable test on Darwin (PR #173836)

[via llvm-commits]

MetalOxideSemi wrote:

> Tests should not be added to "Generic" codegen; there is no such thing. For this case you should move the test to X86, use an explicit triple, and make an additional xfailed copy in AArch64 that demonstrates the crash

@arsenm I've updated the PR based on your feedback. The tests are now in 
X86/AArch64 directories with explicit triples, and marked UNSUPPORTED on 
Darwin.

I'd be grateful if you could review it when you have a moment. Thank you 
for your time!


https://github.com/llvm/llvm-project/pull/173836