[sledge] Add nonsupport for CallBr instruction
[sledge] Add nonsupport for CallBr instruction

Summary:
This is a form of call only used with inline asm, so currently not
supported.

Reviewed By: jvillard

Differential Revision: D27280742

fbshipit-source-id: f286e7886

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