public void fallthruOp() {
		current_op += 1;
		if (current_op >= pcode.length) {
			last_op = -1;
			setCurrentAddress(current_address.addWrap(instruction_length));
		}
	}
Update the iterator into the current pcode cache, and if necessary, generate
the pcode for the fallthru instruction and reset the iterator.
Ghidra/Framework/Emulation/src/main/java/ghidra/pcode/emulate/Emulate.java