#5223 altered `JSXElementName` so `JSXElementName::Identifier` is used only for non-reference JSX names (e.g. `<div>`). `JSXElementName::IdentifierReference` is used where the name is a reference (e.g. `<Foo>`). Similarly `JSXMemberExpressionObject`'s `object` is always an `IdentifierReference` now.
So, the net result is that `JSXIdentifier` is now never a reference, it's just the JSX equivalent of `IdentifierName`. So I don't think `JSXIdentifier` can ever have side-effects.
This PR:
1. Removes `impl ListenerMap for JSXIdentifier`
2. Adds `impl ListenerMap for JSXMemberExpression` and makes sure the root `IdentifierReference` (`Foo` in `<Foo.bar.qux>`) is visited.
82c0a167c4