folly | Remove unnecessary reinterpret_cast in Executor
folly | Remove unnecessary reinterpret_cast in Executor

Summary: Input and output types for the cast are the same (except const qualifier) and therefore it's not required.

Reviewed By: milend

Differential Revision: D15694981

fbshipit-source-id: d5a811d97cc145ba9c232b79f6c8fa52041b0cf0

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly