simplify: implement standard copyprop #418
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Implements a more standard implementation of flow-insensitive copyprop (disabled) as well as a similar transform targeted specifically at address calculations: for values conforming to a (variable + constant) structure.
By deferring substitution we avoid tracking clobbers so this is >2x faster than the existing 'DSACopyProp', and is more effective at removing redundant dsa copies involved in loops. It is still sufficient to fully propagate through stack address calculations so none of the tests should timeout.
This does not handle propagating flag calculations at all, so that relies entirely on #413
note: translation validation succeeds for this program https://github.com/UQ-PAC/basil-tests/blob/main/src/test/csmith/csmith4/csmith4.c#L3552-L3601