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And use it to print the correct default OpenMP version for flang and flang -fc1. This change adds an optional `HelpTextsForVariants` to options. This allows you to change the help text that gets shown in documentation and `--help` based on the program its being generated for. As `OptTable` needs to be constexpr compatible, I have used a std::array of help text variants. Each entry is: (list of visibilities) - > help text string So for the OpenMP version we have (flang, fc1) -> "OpenMP version for flang is...". So you can have multiple visibilities use the same string. The number of entries is currently set to 1, and the number of visibilities per entry is 2, because that's the maximum we need for now. The code is written so we can increase these numbers later, and the unused elements will be initialised. I have not applied this to group descriptions just because I don't know of one that needs changing. It could easily be enabled for those too if needed. There are minor changes to them just to get it all to compile. This approach of storing many help strings per option in the 1 driver library seemed preferable to making a whole new library for Flang (even if that would mostly be including stuff from Clang).