public void setUnaffected(boolean val) {
		bUnaffected = val;
	}
This type of Varnode is a node in an Abstract Syntax Tree
It keeps track of its defining PcodeOp (in-edge) and PcodeOps which use it (out-edges)
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/pcode/VarnodeAST.java