private int findLastActiveOpIndex() {
		for (int i = operations.size() - 1; i >= 0; i--) {
			if (operations.get(i).getOpCode() != DWARFExpressionOpCodes.DW_OP_nop) {
				return i;
			}
		}
		return operations.size() - 1;
	}
Returns the index of the last operation that is not a NOP.
@return
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/expression/DWARFExpression.java