sun/tools/jmap/BasicJMapTest.java fails after JDK-8232759 due to the removal of GC.class_stats in the VM.
jmap -clstats doesn't work any more.

```
[2020-01-11T03:03:59.930482Z] Waiting for completion for process 37563
[2020-01-11T03:03:59.930565Z] Waiting for completion finished for process 37563
[/Users/fool/workspace/open/jdk/build/macosx-x86_64-server-release/images/jdk/bin/jmap, -clstats, 37553]
[2020-01-11T03:03:59.933976Z] Gathering output for process 37564
Exception in thread "main" com.sun.tools.attach.AttachOperationFailedException: java.lang.IllegalArgumentException: Unknown diagnostic command
        at jdk.attach/sun.tools.attach.VirtualMachineImpl.execute(VirtualMachineImpl.java:223)
        at jdk.attach/sun.tools.attach.HotSpotVirtualMachine.executeCommand(HotSpotVirtualMachine.java:309)
        at jdk.jcmd/sun.tools.jmap.JMap.executeCommandForPid(JMap.java:133)
        at jdk.jcmd/sun.tools.jmap.JMap.main(JMap.java:118)

[2020-01-11T03:04:00.037617Z] Waiting for completion for process 37564
[2020-01-11T03:04:00.037699Z] Waiting for completion finished for process 37564
[2020-01-11T03:04:00.037746Z] Waiting for completion for process 37564
[2020-01-11T03:04:00.037777Z] Waiting for completion finished for process 37564
STDERR:
 stdout: [];
 stderr: [Exception in thread "main" com.sun.tools.attach.AttachOperationFailedException: java.lang.IllegalArgumentException: Unknown diagnostic command
        at jdk.attach/sun.tools.attach.VirtualMachineImpl.execute(VirtualMachineImpl.java:223)
        at jdk.attach/sun.tools.attach.HotSpotVirtualMachine.executeCommand(HotSpotVirtualMachine.java:309)
        at jdk.jcmd/sun.tools.jmap.JMap.executeCommandForPid(JMap.java:133)
        at jdk.jcmd/sun.tools.jmap.JMap.main(JMap.java:118)
]
 exitValue = 1

java.lang.RuntimeException: Expected to get exit value of [0]

        at jdk.test.lib.process.OutputAnalyzer.shouldHaveExitValue(OutputAnalyzer.java:455)
        at BasicJMapTest.testClstats(BasicJMapTest.java:127)
        at BasicJMapTest.main(BasicJMapTest.java:58)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:564)
        at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
        at java.base/java.lang.Thread.run(Thread.java:832)
```