Fix shadowing declaration in remove-unreachable
Fix shadowing declaration in remove-unreachable

Summary: Doesn't cause problems now, but it's never a good idea.

Reviewed By: dariorussi, newobj

Differential Revision: D4410063

fbshipit-source-id: 8a9b0b8e91f2d6617a41da733421ec439a930958

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex