RFR: Merge jdk [v2]

[Mikael Vidstedt]

> Merge in jdk-16+18

Mikael Vidstedt has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 74 commits:

 - Merge jdk
 - Fix linux close
 - Merge jdk
 - Merge jdk
 - Merge jdk
 - Merge jdk
 - Merge jdk
 - Merge jdk
 - Merge jdk
 - Merge jdk
 - ... and 64 more: https://git.openjdk.java.net/portola/compare/e5ba020e...c70c0c45

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Changes: https://git.openjdk.java.net/portola/pull/16/files
 Webrev: https://webrevs.openjdk.java.net/?repo=portola&pr=16&range=01
  Stats: 496 lines in 33 files changed: 406 ins; 18 del; 72 mod
  Patch: https://git.openjdk.java.net/portola/pull/16.diff
  Fetch: git fetch https://git.openjdk.java.net/portola pull/16/head:pull/16

PR: https://git.openjdk.java.net/portola/pull/16