[Clang] Fix sema checks thinking kernels aren't kernels (#104460) Summary: Currently we have some sema checks to make sure users don't apply kernel-only attributes to non-kernel functions. However, this currently did not correctly check for bare NVPTX / AMDGPU kernel attributes, making it impossible to use them at all w/o CUDA enabled. This patch fixes that by checking for the calling convention / attributes directly.
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