Make sure to allow directly evaluating Declarations that depend on a parent relationship in most cases

[wessberg]

Imagine this:

class Foo {
   someMethod () {}
}

It is now possible to directly evaluate someMethod and retrieve it as a function.
This is one of many examples of nodeWithArgument relationships where the argument is an IndexLiteral.

Other examples include EnumMember, CaseClause, etc. Even if these really do depend on their parents, providing such nodes directly to evaluate() should still resolve to something.