Alternative MeasuredSize storage for IE8. Storing any information in a DOM element in IE8 seems to make the browser think the element has changed in a way that requires a reflow. To work around that, the MeasureData is instead stored in Map for IE8. This implementation is injected for IE8 by a replace-with definition in the GWT module.
@author Vaadin Ltd
@since 7.0.0
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