private void validateOpIndex(int opIndex) {
		if (opIndex >= getNumOperands()) {
			throw new IllegalArgumentException("Invalid operand index [" + opIndex + "] specified");
		}
	}
Returns a string that represents this code unit with default markup.
Only the mnemonic and operands are included.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/code/CodeUnitDB.java