Remove opt_count from SFI, which only had two real uses:

  1. Detecting OSR in tests -- replaced with a stack walk in
     %GetOptimizationStatus
  2. Naming optimization log files -- replaced with the
     optimization id

This allows us to remove a field from the SFI, moving the
bailout reason into the counters field.

As a drive-by, add optimization marker information (e.g.
marked for optimization) to the optimization status.

Change-Id: Id77deb5dd5439dfba058a7e1e1748de26b717d0d
Reviewed-on: https://chromium-review.googlesource.com/592028Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47009}