Review Request JDK-8212795: ThreadInfoCompositeData.toCompositeData fails to map ThreadInfo to CompositeData

[Mandy Chung]

This patch fixes the regression introduced by JDK-8198253 in 11.
It turns out that NetBeans uses the internal sun.management API to
convert ThreadInfo to CompositeData for performance reason.
ThreadInfoCompositeData::toCompositeData is no longer used
in JDK since JMX added the MXBean support in JDK 6. The fix for
JDK-8212197 resolves one issue reported [1] but not the bug in
ThreadInfoCompositeData::toCompositeData. Sven has filed an
issue in NetBeans to replace the use of JDK internal API.

Webrev:
http://cr.openjdk.java.net/~mchung/jdk12/webrevs/8212795/webrev.00/

Thanks
Mandy
[1] 
http://mail.openjdk.java.net/pipermail/serviceability-dev/2018-October/025512.html
[2] https://issues.apache.org/jira/browse/NETBEANS-1478
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