improve getLiveDocs() performance
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Key: LUCENE-3500
URL: https://issues.apache.org/jira/browse/LUCENE-3500
Project: Lucene - Java
Issue Type: Improvement
Reporter: Yonik Seeley
Priority: Minor
On segmentReader, liveDocs is volatile because they used to be loaded on demand.
This no longer appears to be the case... liveDocs are always loaded up front.
This also means that getLiveDocs() can never fail (even after close), and we
can remove the ensureOpen call.
Minor optimizations, but volatile reads still do prevent optimizations across
that boundary.
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