Fix parsing of exception_hierarchy.txt when a platform-specific exception is specified.  Hopefully this wll bring warming to Tim's Windows-loving heart.
Fix parsing of exception_hierarchy.txt when a platform-specific exception is
specified.  Hopefully this wll bring warming to Tim's Windows-loving heart.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator