add a test for with multiple get mores interleaved with other operations

jstests/oro.js

@@ -0,0 +1,27 @@
+// Test $or query with several clauses on separate indexes.
+
+t = db.jstests_oro;
+t.drop();
+
+orClauses = [];
+for( idxKey = 'a'; idxKey <= 'aaaaaaaaaa'; idxKey += 'a' ) {
+    idx = {}
+    idx[ idxKey ] = 1;
+    t.ensureIndex( idx );
+    for( i = 0; i < 200; ++i ) {
+        t.insert( idx );
+    }
+    orClauses.push( idx );
+}
+
+printjson( t.find({$or:orClauses}).explain() );
+c = t.find({$or:orClauses}).batchSize( 100 );
+count = 0;
+
+while( c.hasNext() ) {
+    for( i = 0; i < 50 && c.hasNext(); ++i, c.next(), ++count );
+    // Interleave with another operation.
+    t.stats();
+}
+
+assert.eq( 10 * 200, count );