Address removeNext() {
			Address next = first;
			first = null;
			if (next == null) {
				next = set.first();
			}
			set.remove(next);
			return next;
		}
Returns a list of conflicts for this set.  If a block is not reachable from a non-conflicted
block, it's conflicts(if any) will not be included.
@return the list of conflicts for this set.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/lang/InstructionSet.java