Hi all,

I tried to get thread dump via jstack command on CLHSDB. But it was failed as 
below:

```
Caused by: sun.jvm.hotspot.types.WrongTypeException: field 
"_stack_traversal_mark" in type nmethod is not of type jlong, but instead of 
type long
        at 
jdk.hotspot.agent/sun.jvm.hotspot.types.basic.BasicType.getField(BasicType.java:206)
        at 
jdk.hotspot.agent/sun.jvm.hotspot.types.basic.BasicType.getField(BasicType.java:212)
        at 
jdk.hotspot.agent/sun.jvm.hotspot.types.basic.BasicType.getJLongField(BasicType.java:249)
        at 
jdk.hotspot.agent/sun.jvm.hotspot.code.NMethod.initialize(NMethod.java:108)
        at 
jdk.hotspot.agent/sun.jvm.hotspot.code.NMethod.access$000(NMethod.java:35)
        at 
jdk.hotspot.agent/sun.jvm.hotspot.code.NMethod$1.update(NMethod.java:81)
        at 
jdk.hotspot.agent/sun.jvm.hotspot.runtime.VM.registerVMInitializedObserver(VM.java:451)
        at 
jdk.hotspot.agent/sun.jvm.hotspot.code.NMethod.<clinit>(NMethod.java:79)
        ... 23 more
```

I think this exception is caused by JDK-8186837.
This changeset has changed the type of `nmethod::_stack_traversal_mark` to 
`long` from `jlong`.

SA should follow this change.

I uploaded a webrev for this issue. This webrev is generated from consolidated 
repo (jdk10/master).
Could you review it?

  http://cr.openjdk.java.net/~ysuenaga/JDK-8187597/webrev.00/


I cannot access JPRT. So I need reviewer.


Thanks,

Yasumasa

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