Gets a node representing an instance of this API component, that is, an object whose constructor is the function represented by this node.
For example, if this node represents a use of some class
A, then there might be a node
representing instances of
A, typically corresponding to expressions
new A() at the
This predicate may have multiple results when there are multiple constructor calls invoking this API component.
getAnInstantiation() if there is a need to distinguish between individual constructor calls.