[sledge] Minor simplification of Exec implementation
[sledge] Minor simplification of Exec implementation

Reviewed By: ngorogiannis

Differential Revision: D14403653

fbshipit-source-id: cc612edc5

facebook/infer,facebook/infer,facebook/infer,jvillard/infer,jvillard/infer,jvillard/infer,jvillard/infer,facebook/infer,jvillard/infer,jvillard/infer,facebook/infer,jvillard/infer,facebook/infer,facebook/infer