Construct a LogicNode from a *Low FIRRTL* reference or subfield that refers to a component.
Construct a LogicNode from a *Low FIRRTL* reference or subfield that refers to a component. Since aggregate types appear in Low FIRRTL only as the full types of instances or memories, the only reference-like expressions that may appear are WRefs, or trees of up to two levels of WSubField field selection.
The reference-like expression to describe with a LogicNode
a LogicNode referring to e