FastVectorHighlighter ignores MultiPhraseQuery (and more) [LUCENE-3332]

Similar to #1573.

Create a MultiPhraseQuery, use FastVectorHighlighter, you'll have no fragment.
Using PhraseQuery and/or Highlighter works, but not the previous combination.

---
Migrated from [LUCENE-3332](https://issues.apache.org/jira/browse/LUCENE-3332) by Olivier Favre (@ofavre)
Environment:
```
Tested against Lucene trunk revision 1149488 (4.0), but seen under Lucene 3.3 (tested through ElasticSearch 0.17.1, but the code is clear: this version, and surely other prior (3.1-3.2) are impacted)
```

Attachments: [TestMultiPhraseQueryHighlighting.java](https://apache.github.io/lucene-jira-archive/attachments/LUCENE-3332/TestMultiPhraseQueryHighlighting.java), [UsingCombinationAndFallback.patch](https://apache.github.io/lucene-jira-archive/attachments/LUCENE-3332/UsingCombinationAndFallback.patch), [UsingFallback.patch](https://apache.github.io/lucene-jira-archive/attachments/LUCENE-3332/UsingFallback.patch)

Start with the attached TestMultiPhraseQueryHighlighting.java and trace FastVectorHighlighter handling of MultiPhraseQuery, comparing it with the working PhraseQuery and Highlighter cases. Run the attached test against the affected Lucene versions; done means the MultiPhraseQuery produces a fragment rather than no output.

Written by the indexing model from the issue text.