[clang] [clang] Extend -Wunused-but-set-variable to static globals (PR #178342)

[John Paul Jepko via cfe-commits]

jpjepko wrote:

If there are no further comments on this change may I request someone merge? I 
don't have commit access 😃

https://github.com/llvm/llvm-project/pull/178342
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