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Simulator performance #2

A bit more work on the threaded version brings us up to 54.9 million instructions/s.  The interesting thing is that an average of 6.75 instructions are executed in a row before some type of branch.  This seems high enough to justify a simple JIT that converts a branchless sequence into native code…

These changes however break the profiling and breakpoint support in the simulator.  Shifting to a more complex/faster compiled version could bring these back in for free.

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