protected String stringifyUnique(long offset) {
		return "$U" + Long.toHexString(offset);
	}
Convert a given unique variable to a string as it should be conventionally displayed.

@param offset the variable's offset
@return the display string, e.g., {@code $U1234}
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/util/pcode/AbstractAppender.java