RFR (S) 8217337: [TESTBUG] TestThreadDumpClassInitMonitor.java fails with Unexpected thread info line

[David Holmes]

Bug: https://bugs.openjdk.java.net/browse/JDK-8217337
webrev: http://cr.openjdk.java.net/~dholmes/8217337/webrev/

Please review this simple adjustment to a test I recently added. In 
debug builds there are two extra lines in the stacktrace, so we have to 
skip these in a product build.

Thanks,
David