[sledge] Add missing import of trace into symbheap
[sledge] Add missing import of trace into symbheap

Reviewed By: ngorogiannis

Differential Revision: D17665241

fbshipit-source-id: 6f70e2925

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