Fix TestScorerUtil.testLikelyFixedBits

Recognize SparseLiveDocs and DenseLiveDocs as optimized implementations that don't need FilterBits wrapping

Author: salvatorecampagna

lucene/core/src/java/org/apache/lucene/search/ScorerUtil.java

@@ -93,6 +93,10 @@ static Bits likelyLiveDocs(Bits acceptDocs) {
       return acceptDocs;
     } else if (acceptDocs.getClass() == DEFAULT_ACCEPT_DOCS_CLASS) {
       return acceptDocs;
+    } else if (acceptDocs instanceof org.apache.lucene.util.SparseLiveDocs
+        || acceptDocs instanceof org.apache.lucene.util.DenseLiveDocs) {
+      // SparseLiveDocs and DenseLiveDocs are already optimized implementations
+      return acceptDocs;
     } else {
       return new FilterBits(acceptDocs);
     }