vmiklos added a comment. The alternative is to change the `CommonOptionsParser` ctor to take a vector of `OptionCategory&`, and in that case we can add the -extra-arg-before and other options to all subcommands, but that means he'll have to adapt all client code, i.e. all tools in clang-tools-extra that uses CommonOptionsParser. Is that an acceptable cost? Or did I miss some easier way?
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