[clang] [lld] [llvm] AMDGPU: Remove xnack and sramecc subtarget features (PR #212792)

[Scott Linder via cfe-commits]

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slinder1 wrote:

Is there a reason for undoing the subarch triple change here? (Same question in other tests that do the same)

https://github.com/llvm/llvm-project/pull/212792