[8u 8209863] Request for approval for CR 8209863 - Add a Test for EnableTracing feature

[Liu, Xin]

BUG: https://bugs.openjdk.java.net/browse/JDK-8209863
Webrev: http://cr.openjdk.java.net/~phh/8209863/webrev.03/
discussion:  http://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2018-September/030078.html

We decide to add a test to verify feasure ‘-XX:+EnableTracing’.  OracleJDK replace this feature with JFR, so the test bypass it.
dholmes and phh reviewed it and phh will sponsor it.

Thanks,
--lx