Add weight to compiled/interpreter transitions.

Also:
- Cleanup logging.
- Check ArtMethod status before adding compilation requests.
- Don't request osr compilation if we know AddSamples does not come
  from a back edge.

Bug: 27865109

(cherry picked from commit 71cd50fb)

Change-Id: Icbe89fe6cc495b113616391a8f257758d34b4b60