RFR: 8142437: SafepointTest.java is occasionally failing in JPRT

[Rachel Protacio]

Hello,

Please see this small fix, which removes the flaky code. We know the 
safepoint logging system works - this is a compilation timing issue - so 
this change does not damage the integrity of the test. I also improved 
the class name and some comments.

Summary: A method compilation causing a specific log message to print, 
is not always being compiled. The log message is not central to testing 
the safepoint logging functionality, so it should be removed.
Open webrev: http://cr.openjdk.java.net/~rprotacio/8142437/
Bug: https://bugs.openjdk.java.net/browse/JDK-8142437

Thank you,
Rachel