[clang] [clang codegen][regression] Add dso_local/hidden/etc. markings to VTT definitions and declarations (PR #72452)

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bd1976bris wrote:

> I'd prefer not to call setGVProperties() twice on the same variable; under what conditions is the first call not sufficient?

The test-case I posted is one such scenario: https://godbolt.org/z/s4rPffsrK. I suspect it may be related to whether there is a key function present. I'm not an expert in this area of the code so I'll have to investigate further.

https://github.com/llvm/llvm-project/pull/72452