Fix markLine in stack.
Fix markLine in stack.

Fix markLine in stack.
(1) when xAxis or yAxis is set, the markLine is layout only by the given xAxis or yAxis value but has nothing to do with data
(2) Stacked dimension should be retrieved by util `dataStackHelper` but not visit private props directly
(3) valueIndex fix.
apache/incubator-echarts,apache/incubator-echarts,ecomfe/echarts,ecomfe/echarts