Summary:
This diff cleans up a bunch of code in `symbolicateStackTrace`. According to motiz88 all of it is dead code and I can confirm symbolication does not break with the changes applied.
Changelog: [Internal]
Reviewed By: yungsters
Differential Revision: D24585849
fbshipit-source-id: 5b2c76f56dbbbf27449ce1472cdd0271ed230c35