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Start to lower $_ from lexical to local
This almost passes spectest, thanks to the various preparatory changes that were done. It also gives a quite nice speedup on the empty range benchmark, since the unused `$_` now uses a local, which we can in turn see is completely unused, and therefore throw out a boxing operation, thus meaning it can JIT into a rather tighter loop. Alas, it seems that despite the wins, this costs us something on some benchmarks, which will need further examination.
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