R1:a3028558aeb2

Make includes free to the user (application support component)

Summary:
We spend a significant amount of time running includes, even with APC. However, we have rigidly structured includes and can safely run them all in workers before requests occur.

Right now, requests go like this:

- Apache spawns a worker.
- Client sends an HTTP request.
- Apache interprets it.
- Apache sees it's ".php", so it hands it off to the PHP SAPI.
- The PHP SAPI starts the PHP interpreter in the worker.
- The…