@Override
	default void visitPhiOp(JitPhiOp op) {
		for (JitVal opt : op.options().values()) {
			visitVal(opt);
		}
	}
A visitor that traverses the use-def graph upward, that is from uses toward definitions
Ghidra/Framework/Emulation/src/main/java/ghidra/pcode/emu/jit/analysis/JitOpUpwardVisitor.java