Holds if basic block
controlled is controlled by this control flow element
with conditional value
s. That is,
controlled can only be reached from
the callable entry point by going via the
s edge out of some basic block
ending with this element.
This predicate is different from
exists(ConditionBlock cb | cb.getLastNode() = this.getAControlFlowNode() | cb.controls(controlled, s) )
as control flow splitting is taken into account.
cb records all of the possible condition blocks for this control flow element
that a path from the callable entry point to
controlled may go through.