public AddressSetView getUnmatchedCode(Side side) {
		return side == LEFT ? unmatchedCode1 : unmatchedCode2;
	}
Gets the address set for unmatched code for the given side
second listing.
@param side the LEFT or RIGHT side
@return the addresses of the unmatched code in the first listing.
Ghidra/Features/Base/src/main/java/ghidra/program/util/ListingDiff.java