RFR: 8214925: JFR tool fails to execute

[Erik Gahlin]

Hi,

Could I have a review of a fix of a test bug that prevents the 
JDK_HOME/bin/jfr tool to launch on Mac OS X and Linux.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8214925

Webrev:
http://cr.openjdk.java.net/~egahlin/8214925/

Testing:
tier1, tier2, tier5

Thanks
Erik