bpo-24960: use pkgutil.get_data in lib2to3 to read pickled grammar files (#4977)
This is more complicated than it should be because we need to preserve the useful mtime-based regeneration feature that lib2to3.pgen2.driver.load_grammar has. We only look for the pickled grammar file with pkgutil.get_data and only if the source file does not exist.
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