[clang] [Clang] Fix sema checks thinking kernels aren't kernels (PR #104460)

[Joseph Huber via cfe-commits]

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@@ -7147,7 +7147,9 @@ void Sema::ProcessDeclAttributeList(
   // good to have a way to specify "these attributes must appear as a group",
   // for these. Additionally, it would be good to have a way to specify "these
   // attribute must never appear as a group" for attributes like cold and hot.
-  if (!D->hasAttr<OpenCLKernelAttr>()) {
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jhuber6 wrote:

Further down, we check explicitly for `CUDAGlobalAttr`, which implies this is intended to be checked against non-OpenCL code.

https://github.com/llvm/llvm-project/pull/104460