Merge in-progress PowerPC "JIT1" engine for AMD64, IA-32, PPC. The merge probably got wrong as there are some problems probably due to the experiment begining with CR deferred evaluation. With nbench/ppc, performance improvement was around 2x. With nbench on x86, performance improvement was around 4x on average. Incompatible change: instr_info_t has a new field in the middle. But since insertion of PPC_I(XXX) identifiers is auto-generated, there is no problem.
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