Some general code cleanup and comments. In PNTransformDriver.cpp removed the...

Some general code cleanup and comments. In PNTransformDriver.cpp removed the reset_undo functionality, there is no need to reset unless and undo actually occurs. In Rewrite_Utility.cpp the getExitCode is now getHandlerCode, which is passed the policy. This change will be used for more clever uses of canaries in the future for validation, such as validating multiple functions at once and reviewing all overflows that occurred. 




Former-commit-id: bbe55f93be7dc84b8e15d4342c9a1cef65e76ba1