[llvm] [AMDGPU] Create dir for amdgpu specific machineverifier tests (PR #106960)

[Aditi Medhane via llvm-commits]

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@@ -0,0 +1,2 @@
+if not "AMDGPU" in config.root.targets:
+    config.unsupported = True
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AditiRM wrote:

done.

https://github.com/llvm/llvm-project/pull/106960