Adds -fdebug-dump-parsing-log in the new driver. This option is
semantically identical to -fdebug-instrumented-parse in f18 (the
former is added as an alias in f18).
As dumping the parsing log makes only sense for instrumented parses, we
set Fortran::parser::Options::instrumentedParse to True when
-fdebug-dump-parsing-log is used. This is consistent with f18. To
facilate tweaking the frontend based on the action being run,
setUpFrontendBasedOnAction in CompilerInvocation.cpp is introduced.
Will this function be extended in the future?
If not, an entirely separate function for a couple statements seems rather overkill.