RFR of JDK-8160866: IntPrimitiveOpsTests.java still in ProblemList.txt while related bug has been closed

[Hamlin Li]

Would you please review the following patch which remove 
IntPrimitiveOpsTests.java from ProblemList.txt?

bug: https://bugs.openjdk.java.net/browse/JDK-8160866
webrev: http://cr.openjdk.java.net/~mli/8160866/webrev.00/
Thank you
-Hamlin