HPCC-16003 Terasort optimization

Signed-off-by: Mark Kelly <mark.kelly@lexisnexis.com>

testing/benchmarks/ecl/terasort.ecl

@@ -22,6 +22,7 @@
 #option('crcReadEnabled', false);
 #option('crcWriteEnabled', false);
 #option('timeActivities', false);
+#option('optimizeLevel', 3);
 
 rec := record
      string10  key;