RFR: 8301341: LinkedTransferQueue does not respect timeout for poll() [v3]

[Doug Lea]

> This now uses Thread.isVirtual to distinguish spin vs immediate block cases, enabling re-introduction of spin control from the previous version, removing anomalies like this one.

Doug Lea has updated the pull request incrementally with one additional commit since the last revision:

  Overhaul LTQ and SQ to use common blocking and matching mechanics

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14317/files
  - new: https://git.openjdk.org/jdk/pull/14317/files/eec7e491..67a145a0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14317&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14317&range=01-02

  Stats: 1655 lines in 3 files changed: 307 ins; 947 del; 401 mod
  Patch: https://git.openjdk.org/jdk/pull/14317.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14317/head:pull/14317

PR: https://git.openjdk.org/jdk/pull/14317