Add a test that stresses the GC locker by filling up DirectByteBuffers while simultaneously filling up old gen.
            
- relates to
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                    JDK-8278115 gc/stress/gclocker/TestGCLockerWithSerial.java has duplicate -Xmx -           
- Resolved
 
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                    JDK-8180311 [TESTBUG] gc/stress/gclocker/TestGCLockerWithSerial fails with ClassNotFoundException: java.lang.management.ManagementFactory -           
- Resolved
 
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                    JDK-8179226 gc/stress/gclocker/TestGCLockerWithG1.java: fails with OOME Java heap space -           
- Closed
 
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