RFR: 8234131: Miscellaneous changes imported from jsr166 CVS 2020-12 [v2]

[Martin Buchholz]

> 8234131: Miscellaneous changes imported from jsr166 CVS 2020-12

Martin Buchholz has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  JDK-8234131

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1647/files
  - new: https://git.openjdk.java.net/jdk/pull/1647/files/ed43b3fe..a6d85863

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1647&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1647&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1647.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1647/head:pull/1647

PR: https://git.openjdk.java.net/jdk/pull/1647