Use the initial value of translatesAutoresizingMaskIntoConstraints to determine
if autolayout or not. This is less than ideal but reflects the transitional
nature of autolayout. For example, if autolayout is selected in the nib file
but the top-level view still has translatesAutoresizingMaskIntoConstraints
set in interface builder, then the top-level view is considered to use
springs and struts.