Remove unnecessary dependency graph calculation
Remove unnecessary dependency graph calculation

Summary: This is calculated just a few lines above. `dependency_info` is immutable and it isn't rebound, so the second call will always have the same result.

Reviewed By: gabelevi

Differential Revision: D18238985

fbshipit-source-id: aa1b3e209a15eca063cd9e405055a37947b267ec

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