[clang] [Driver][ROCm][ASan] Skip checking ':xnack+' feature for gfx12. (PR #126885)

[Joseph Huber via cfe-commits]

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@@ -1112,6 +1112,11 @@ bool AMDGPUToolChain::shouldSkipSanitizeOption(
 
   assert(OptionalGpuArch && "Invalid Target ID");
   (void)OptionalGpuArch;
+
+  // Skip checking 'xnack+' feature availability for gfx12 family.
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jhuber6 wrote:

The fact that target-id's push target  features into the `mcpu` value always made this kind of thing messy. Why do we even need this if `xnack` isn't used on gfx12? Isn't it always on or something.

https://github.com/llvm/llvm-project/pull/126885