RFR: 8301341: LinkedTransferQueue does not respect timeout for poll() [v2]

[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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'openjdk:master' into JDK-8301341
 - Use Thread.isVirtual to distinguish spin vs immediate block cases

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/14317/files
  - new: https://git.openjdk.org/jdk/pull/14317/files/c36bbe0e..eec7e491

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14317&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14317&range=00-01

  Stats: 83867 lines in 2037 files changed: 53853 ins; 19941 del; 10073 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