[clang] remove 3 year obsolete TODO
[clang] remove 3 year obsolete TODO

Summary: Was fixed in D2895364.

Reviewed By: mbouaziz, ngorogiannis

Differential Revision: D16090038

fbshipit-source-id: 10340bb1f

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