RFR(S/M): 8069160: serviceability/dcmd/compiler/CompilerQueueTest.java fails due to class not found

[Nils Eliasson]

Hi,

I need a review of this fix of the CompilerQueueTest.

Summary:
This test was checking the output from the Compiler.queue diagnostic 
command - testing each queue entry by reflection. This was fragile 
because different methods end up in the queue every run and what classes 
are reflectable changes over time.

Solution:
In the improved version the whitebox API is used to block compilation 
and then enqueue methods for all available compilation levels. Then the 
jcmd is executed and the output is verified to contain the specific test 
methods. In some scenarios where the compile queue is overwhelmed by 
requestm, entries might get evicted. The test take that into account too.

Testing:
Run test on all platforms

Bug: https://bugs.openjdk.java.net/browse/JDK-8069160
Webrev: http://cr.openjdk.java.net/~neliasso/8069160/webrev.03/

Best regards,
Nils Eliasson