public List<Instruction> getUnmatchedInstructionsInFirst() {
		return srcStore.getUnmatchedInstructions();
	}
Determines the number of instructions from the first function that do not match an 
instruction in the second function.
@return the number of instructions in the first function without matches.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/correlate/HashedFunctionAddressCorrelation.java