[clang] [CUDA] Treat function-scope statics in device code as device variables (PR #222985)

[Ambrose Leeb via cfe-commits]

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Sirraide wrote:

Side note: This check is wrong now; this needs to use `getEnclosingFunction()`, but that can be fixed in a separate patch.

https://github.com/llvm/llvm-project/pull/222985