Address getAddress() {
		if (currentAddr != null &&
			program.getListing().getInstructionContaining(currentAddr) == null) {
			currentAddr = null;
		}
		return currentAddr;
	}
Get the current address for the instruction whose fallthough
may change.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/fallthrough/FallThroughModel.java