SERVER-9757 Add perftest for Status
SERVER-9757 Improve performance of Status as a return value

- Make OK be represented by a NULL ErrorInfo pointer, making it much faster to construct and
  return an OK Status.

- Inline most of the trivial methods of Status, but particuarly the refcounting, so that
  returning a Status doesn't require any function calls.

- Remove the no longer necessary machinery around statics.

- Move lifecycle inlines to a -inl.h header for clarity.
SERVER-9757 Move Status inlines to inline header