void visitRetireable(Varnode vn) {
			for (JitVal val : analyzer.getOutput(vn)) {
				visitVal(val);
			}
		}
Visit a varnode that could be retired upon exiting a block

<p>
This applies whether exiting the passage altogether or just flowing to another block. It
will find all definitions (including just-generated phi nodes) and visit them.

@param vn the retireable varnode
Ghidra/Framework/Emulation/src/main/java/ghidra/pcode/emu/jit/analysis/JitOpUseModel.java