[codemod] Preserve comments on imports in imports/exports codemod
[codemod] Preserve comments on imports in imports/exports codemod

Reviewed By: pieterv

Differential Revision: D21731107

fbshipit-source-id: 4f0767cd51f98ce41b9a66bbf7a1d044cb18f924

facebook/flow,mroch/flow,facebook/flow,mroch/flow,mroch/flow,mroch/flow,facebook/flow,mroch/flow,facebook/flow,facebook/flow,facebook/flow,facebook/flow,mroch/flow,mroch/flow