private void dw_op_pick(int index) {
		int stackindex = 0;
		for (Long stackElement : stack) {
			if (stackindex == index) {
				push(stackElement);
				break;
			}
			stackindex++;
		}
	}
@param _expr
@param stackArgs - pushed 0..N, so stackArgs[0] will be deepest, stackArgs[N] will be topmost.
@return
@throws DWARFExpressionException
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/expression/DWARFExpressionEvaluator.java