RFR: Merge jdk20

[Jesper Wilhelmsson]

Forwardport JDK 20 -> JDK 21

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Commit messages:
 - Merge remote-tracking branch 'jdk20/master' into Merge_jdk20
 - 8298893: Rename option UsePolyIntrinsics to UsePoly1305Intrinsics
 - 8298726: (fs) Change PollingWatchService to record last modified time as FileTime rather than milliseconds
 - 8298642: ParallelGC -XX:+UseNUMA eden spaces allocated on wrong node
 - 8298588: WebSockets: HandshakeUrlEncodingTest unnecessarily depends on a response body
 - 8299156: Broken link in jdk.compiler/module-info.java
 - 8298947: compiler/codecache/MHIntrinsicAllocFailureTest.java fails intermittently
 - 8299147: Minor accessibility errors in the specs and man index pages

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.org/jdk/pull/11759/files
  Stats: 16 lines in 9 files changed: 4 ins; 0 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/11759.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11759/head:pull/11759

PR: https://git.openjdk.org/jdk/pull/11759