exportloopref may be able to check decendants member like `a.b.c.d...`

#2 is the problem that when a parent of Selector (i.e. `a` of the `a.b`) is the pointer, exportloopref reports false-positive.

In past, I thought that exportloopref cannot report `&a.b.c.d` since it cannot check each of the layer in the Selectors is not a pointer.
But now, I found the solution ( `*analysis.Pass.TypeInfo` ).
So maybe I can check that.