RFR: Merge jdk [v2]

[Mikael Vidstedt]

> Merge in jdk-16+28

Mikael Vidstedt has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 77 commits:

 - Merge jdk
 - Merge jdk
 - Merge jdk
 - JEP 386 patch - minor cleanup
 - Fix linux close
 - Merge jdk
 - Merge jdk
 - Merge jdk
 - Merge jdk
 - Merge jdk
 - ... and 67 more: https://git.openjdk.java.net/portola/compare/37043b05...fd36fe86

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Changes: https://git.openjdk.java.net/portola/pull/18/files
 Webrev: https://webrevs.openjdk.java.net/?repo=portola&pr=18&range=01
  Stats: 40 lines in 2 files changed: 19 ins; 13 del; 8 mod
  Patch: https://git.openjdk.java.net/portola/pull/18.diff
  Fetch: git fetch https://git.openjdk.java.net/portola pull/18/head:pull/18

PR: https://git.openjdk.java.net/portola/pull/18