[whatwg/dom] Address infinite loop in TreeWalker's nextNode() (#794)

See https://github.com/whatwg/dom/issues/787#issuecomment-550485387 onward for analysis and test references.

Fixes #787.

@pwombwell care to review? I'll land it next week I suppose if all is in order.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/794

-- Commit Summary --

  * Address infinite loop in TreeWalker's nextNode()

-- File Changes --

    M dom.bs (4)

-- Patch Links --

https://github.com/whatwg/dom/pull/794.patch
https://github.com/whatwg/dom/pull/794.diff

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