JavaScript:SpiderMonkey:Refactor2010

Refactor jstracer.cpp

Tracking bug is bug 602695.

• [Landed on TM] Create tracejit/ (will be done as part of bug 602703).

• Rename trace-tests (bug 605374).

• [Landed on TM] Create a layer over Nanojit's LIR creation API (bug 602703). This will pull quite a few functions out of TraceRecorder, as well as encapsulating the LIR writer pipeline.

• Move Tracker into its own file.

• Move Oracle into its own file.

• Move TraceMonitor into its own file.

• Move TreeFragment into its own file.

• Move TypeMap into its own file.

• Move LoopProfile into its own file.

• Move all that slot visiting code into its own file or files.

Other stuff

• Replace JSBool with bool throughout?

• Move lots of stuff into the js namespace, remove js_ prefixes?