RFR: JDK-8051349: nsk/jvmti/scenarios/sampling/SP06/sp06t003 fails in nightly

[Gary Adams]

After some testing with nsk verbose messages enabled,
it is clear that this test is failing in checkThreads when the
location did not match between the call to GetStackTrace
and GetFrameLocation. For the tests that are run when the threads
have not been suspended, there is no guarantee the locations
will match.

   Issue: https://bugs.openjdk.java.net/browse/JDK-8051349
   Webrev: http://cr.openjdk.java.net/~gadams/8051349/webrev.00/