[sledge] Manually set exception backtrace recording
[sledge] Manually set exception backtrace recording

Summary:
Base, ridiculously, enables backtrace recording by default. So
manually disable it unless in debug mode.

Reviewed By: kren1

Differential Revision: D16069450

fbshipit-source-id: 34cded329

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