[crac] RFR: 8348666: [CRaC] sun.nio.ch.Pollers does not handle checkpoint

[Timofei Pushkin]

Adds CRaC support to `sun.nio.ch.Poller` and its implementations

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Commit messages:
 - Windows Poller CRaC support
 - sun.nio.ch.Pollers does not handle checkpoint

Changes: https://git.openjdk.org/crac/pull/190/files
  Webrev: https://webrevs.openjdk.org/?repo=crac&pr=190&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348666
  Stats: 267 lines in 5 files changed: 257 ins; 3 del; 7 mod
  Patch: https://git.openjdk.org/crac/pull/190.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/190/head:pull/190

PR: https://git.openjdk.org/crac/pull/190