public DWARFLineProgramInstruction step() throws IOException {
		DWARFLineProgramInstruction instr = stepInstr();
		return instr;
	}
Read the next instruction and executes it

@return 
@throws IOException if an i/o error occurs
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/line/DWARFLineProgramExecutor.java