RFR: 8232636: JFR TestDumpOnCrash.java crashed and failed to create emergency

[Erik Gahlin]

Hi,

Could I have a review of a test fix that takes into account that crash 
dump may not always be produced.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8232636

Webrev:
http://cr.openjdk.java.net/~egahlin/8232636/

Testing:
jdk/jdk/jvm/TestDumpOnCrash.java 100 times

Thanks
Erik