RFR: 8146530: [testbug] some tests fail because the compiler is using Java heap memory

[Stefan Johansson]

Hi all,

Please review this test fix for:
https://bugs.openjdk.java.net/browse/JDK-8146530

Webrev:
http://cr.openjdk.java.net/~sjohanss/8146530/hotspot.00/

Summary:
This test seems to fail because of two things. Either because it is 
executed with +ExplicitGCInvokesConcurrent or that a Java compiler is 
used via JVMCI. The suggested fix is to use @requires to avoid running 
the test with these options.

The reason ExplicitGCInvokesConcurrent fails the test is because the 
test is written to rely on calling System.gc() to have a clear view when 
starting the test, and if this call instead starts a concurrent cycle 
the test might fail.

Using JVMCI causes the test to fail because it leads to unexpected 
amount of allocated data and there for the assumptions made by the test 
does not hold.

Testing:
Verified that the test is not executed when these options are given on 
the command-line.

Thanks,
Stefan