RFR: 8356177: Regression after JDK-8352180

[Alex Menkov]

The fix handles a special case when `AttachListener::dequeue()` fails to read/parse attach command request and 'PipeChannel' destructor is called when the current thread is `blocked`.

Testing: tier1..4,hs-tier5-svc

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Commit messages:
 - fix

Changes: https://git.openjdk.org/jdk/pull/25219/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25219&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8356177
  Stats: 82 lines in 2 files changed: 78 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/25219.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25219/head:pull/25219

PR: https://git.openjdk.org/jdk/pull/25219