[clang] Add a "don't override" mapping for -fvisibility-from-dllstorageclass (PR #74629)

[Paul T Robinson via cfe-commits]

pogo59 wrote:

Ben and I talked about this offline. I was a little skittish about these power-user options letting you do whatever you wanted, and maybe a small number (2? 3?) of predefined combinations would be more straightforward. He convinced me that (a) these wouldn't be needed often, and (b) people who did want to use them would already be thinking in terms of visibility so adding predefined combinations would actually add _more_ complexity.

https://github.com/llvm/llvm-project/pull/74629