Comment 9 for bug 579337

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regarding al/ah=>AX:

while the notion of a "subregister" may be sufficient for the 8086 (and in fact most similar processors), there are cases where a more generic approach might be better: some processors implement "SFR/SPR": special function/purpose registers, some of which often only mirror/map portions of another register, thus maybe "subregister" could be better implemented as an "alias" for a configurable bit range of another register?