The test does a "threadcontext -v -a", and from the following output determines 
the threadID of the SteadyStateThread:

  `Thread "SteadyStateThread" id=23 Address=0x000001dc51749420`

It then tries threadcontext on this id, but it fails:


 + threadcontext -v 23
Couldn't find thread 23 


This only happens on Windows. It turns out that each time you attach on Window, 
the threadID for a thread can change. Some added diagnostic output showed that 
for the SteadyStateThread, it changed from 23 to 20, and there is no thread 
with an ID of 23.

The only way to make this this part of the test work Windows as expected is to 
parse the output of "threadcontext -v -a" without first doing a detach, and 
then doing the "threadcontext -v 23" without having to attach again. 
Unfortunately the test infrastructure for Clhsdb tests (and specifically 
ClhsdbLauncher) don't make this easy to do this. You can't easily see the 
output without first detaching, and then attach again on the next command. For 
this reason I've chosen to not verify the output of the "threadcontext -v <id>" 
part of the test when running on Windows. ClhsdbLauncher will still do the 
normal checks to make sure no exceptions or errors are present in the output.

-------------

Commit messages:
 - Don't expect Windows be able to dump the SteadyStateThread context.

Changes: https://git.openjdk.java.net/jdk/pull/7259/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7259&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280770
  Stats: 20 lines in 1 file changed: 12 ins; 4 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7259.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7259/head:pull/7259

PR: https://git.openjdk.java.net/jdk/pull/7259

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