Complete PPC methodjit (with type inference)

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Tracejit is dying, see

https://bugzilla.mozilla.org/show_bug.cgi?id=693815

Expected timeframe for disabling is 10; likely to be ended completely in 11. We 
need to get methodjit completed in a testable form at least when we release the 
9 beta, which will be by November.

Original issue reported on code.google.com by classi...@floodgap.com on 12 Oct 2011 at 1:30

• Blocking: G5 JS behaves differently on twitpic #106, Deal with the inevitable stack overrun once and for all #114, Methodjit slows down sendspace.com  #119, G5 JS behaves differently on twitpic #106
• Blocked on: Implement hybrid js tracer + YARR regex jit #101