Currently, three test262 tests are excluded in ant test262parallel.

+ ${test262.suite.dir}/ch07/7.4/S7.4_A6.js \
+ ${test262.suite.dir}/ch07/7.8/7.8.5/S7.8.5_A1.4_T2.js \
+ ${test262.suite.dir}/ch15/15.2/15.2.3/15.2.3.6/15.2.3.6-4-170.js

These fail due to https://bugs.openjdk.java.net/browse/JDK-8134883

These tests have to be included for test run once 8134833 is fixed.