[cost] Fix class name lookup in Cold Start
[cost] Fix class name lookup in Cold Start

Reviewed By: jvillard

Differential Revision: D14870135

fbshipit-source-id: 623777865

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