Implement PPCBC: optimize the shizznick out of BaselineCompiler

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Part 1: optimize int32 and boolean multi-type guards
Part 2: optimize object and string or int32 multi-type guards
Part 3: optimize object and shape/clasp guards
Part 4: optimize double guards

Part 1 is already implemented. 6% improvement on V8.

Original issue reported on code.google.com by classi...@floodgap.com on 11 Oct 2013 at 4:27

• Blocking: IonMonkey PPC backend #178