Fiora 7ba9a8537b JIT: add basic register allocation heuristics
Should be at least a bit better than the previous LRU approach. Currently
has two basic components: whether a register is dirty (dirty registers need
to be stored, so clobbering them hurts more) and how many other registers will
be used between now and the next time a register gets used.

Also don't pre-load values that don't need to be in registers.
2014-10-09 20:09:14 -07:00
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