RFR (XS) 8145620 - Disable compiler/floatingpoint/ModNaN.java

[Ioi Lam]

Please review a very very small but urgent fix:

http://cr.openjdk.java.net/~iklam/jdk9/8145620-disable-modnan/

Bug: Disable compiler/floatingpoint/ModNaN.java

    https://bugs.openjdk.java.net/browse/JDK-8145620

Summary of fix:

    This test is failing intermittently when building the hs-rt
repo with JPRT. The test should be disabled to avoid disruption
    of JPRT jobs while the main issue is being investigated.


Thanks
- Ioi