JMX: Add an MXBeans method to query GC CPU time

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      The VM supports retrieval of GC CPU time since JDK-8359110. OpenJDK has supported com.sun.management.OperatingSystemMXBean.getProcessCpuTime() since JDK 5. This patch augments the developers toolbox to understand where CPU time is spent.

      Introducing this through JMX allows a developer to query process and GC CPU time during critical section and/or after JIT warmup.

        1.
        		 Release Note: New Method MemoryPoolMXBean.getTotalGcCpuTime() Sub-task Open Jonas Norlinder  

            Assignee:
            Jonas Norlinder
            Reporter:
            Jonas Norlinder
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              Created:
              Updated: