RFR: 8301341: LinkedTransferQueue does not respect timeout for poll() [v8]

[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:

  nitpicks

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14317/files
  - new: https://git.openjdk.org/jdk/pull/14317/files/94148271..b5e7e8b8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14317&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14317&range=06-07

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 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