[bug hash] Location independent procname
[bug hash] Location independent procname

Summary: In cpp, lambda's operator() name includes line and column numbers which were not ignore in proc name when computing bug hash.

Reviewed By: ngorogiannis

Differential Revision: D24890545

fbshipit-source-id: 95e6735f3

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