Regularise the style and division of responsibilities in symex dispatch #4309
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Specifically: symex_step always dispatches without running either clean_expr or renaming, symex_step
always takes care of the if-unreachable case (usually means skip instruction, but end-of-function has
work to do regardless), symex_step takes care of advancing to the successor instruction after a simple
instruction executes.
No behavioural changes intended here except avoiding a little bit of redundant renaming / simplification
when functions other than symex_step call symex_assume or vcc.