static relo metrics
static relo metrics

Summary: Add some basic metrics for static relo pass.

Reviewed By: bertmaher

Differential Revision: D3581198

fbshipit-source-id: 8bc66774c13e96979f44ac4d9cddb4ff4166f34d

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex