[llvm] [NVPTX] Do not permit calls to ptx_kernel CC (PR #190434)

[Joseph Huber via llvm-commits]

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jhuber6 wrote:

That needs to touch the bitcode writer and auto-upgrade, which seems like a lot of effort to support a decades old test case that never worked in the first place. Could I just regenerate the file? What does using an old one gain us here.

https://github.com/llvm/llvm-project/pull/190434