optimize patternreplacefilter

                 Key: SOLR-1874
                 URL: https://issues.apache.org/jira/browse/SOLR-1874
             Project: Solr
          Issue Type: Improvement
          Components: Schema and Analysis
    Affects Versions: 3.1
            Reporter: Robert Muir
             Fix For: 3.1
         Attachments: SOLR-1874.patch

We can optimize PatternReplaceFilter:
* don't need to create Strings since CharTermAttribute implements CharSequence, 
just match directly against it.
* reuse the matcher, since CharTermAttribute is reused, too.
* don't create Strings/waste time in replaceAll/replaceFirst if the term 
doesn't match the regex at all... check with find() first.

There is more that could be done to make it faster for terms that do match, but 
this is simple and a start.

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