[clang] Thread safety analysis: provide printSCFG definition. (PR #80277)

[Aaron Puchert via cfe-commits]

aaronpuchert wrote:

It might have been commented out so that it doesn't take up space in the compiled binary.

I'd like seeing it compiled, just to make sure it doesn't break. But I'd also like if it doesn't appear in the final binary. Perhaps we can change visibility so that `--gc-sections` or LTO can optimize it out? But I'm not sure if that's enough.

https://github.com/llvm/llvm-project/pull/80277