Memory leak in updateDOMListeners and updateComponentListeners

[fenduru]

Version

2.5.2

Reproduction link

https://jsfiddle.net/opzzsudp/

Steps to reproduce

1. Create a Vue instance that has a reference to a large object in its data
2. Render either a component or an element with any event handler
3. Destroy the Vue instance, remove its element, null out its reference

What is expected?

The Vue instance and the references it contains should be freed for garbage collection

What is actually happening?

The target variables here or here hang onto references and prevent garbage collection

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I have a fix ready for this and will be filing a PR shortly