Over in https://reviews.llvm.org/D137059 we're discussing the naming of a clang flag - would be good to have it be consistent with GCC.
The functionality is to name the BMI (.pcm in Clang's parlance) output file when compiling a C++20 module. Current proposal is to use `-fsave-std-cxx-module-file=` which is certainly precise, but maybe a bit verbose. Clang has some other flags related to modules that skip the std/cxx parts, and are just `-fmodule-*` or `-fmodules-*`, so there's some precedent for that too. Do GCC folks have any veto votes (is the currently proposed name especially objectionable/wouldn't be acceptable in GCC) or preferences (suggestions to add to the pool)?
