[llvm] [NVPTX] Add ptxas verification and kernel test to sm-version test (PR #139543)

[Abhilash Majumder via llvm-commits]

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@@ -113,3 +172,15 @@
 ; SM120a: .target sm_120a
 ; SM121: .target sm_121
 ; SM121a: .target sm_121a
+
+; Simple kernel function that does a basic operation that should work on all SM versions
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abhilash1910 wrote:

This may not be needed here; the ptxas should be sufficient.

https://github.com/llvm/llvm-project/pull/139543