implement grow() for polygon queries too: easy speedup.

lucene/sandbox/src/java/org/apache/lucene/document/LatLonPointInPolygonQuery.java

@@ -120,6 +120,11 @@ final class LatLonPointInPolygonQuery extends Query {
 
         values.intersect(field, 
                          new IntersectVisitor() {
+                           @Override
+                           public void grow(int count) {
+                             result.grow(count);
+                           }
+
                            @Override
                            public void visit(int docID) {
                              result.add(docID);