[clang] [clang][sema] Fix -Wunused-function on target_version'd file-scope Fn's (PR #81167)

[Jon Roelofs via cfe-commits]

jroelofs wrote:

Moved the test to its own file to fix appease buildbots 
9bb54b2aa006e3bf5df5eb8672075dd589fb9ba5

https://github.com/llvm/llvm-project/pull/81167
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