public void addInputOption() {
		if (!hasInputOption()) {
			addOption(BlockFlow.entry(block), new JitInputVar(out.varnode()));
		}
	}
Add the {@link JitInputVar input} option, if not already present
Ghidra/Framework/Emulation/src/main/java/ghidra/pcode/emu/jit/op/JitPhiOp.java