RFR: Merge openjdk/jdk:master

[William Kemper]

Merges tag jdk-21+17

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Commit messages:
 - Merge tag 'jdk-21+17' into merge-jdk-21-17
 - 8305425: Thread.isAlive0 doesn't need to call into the VM
 - 8305678: ProblemList serviceability/sa/ClhsdbInspect.java on windows-x64 in Xcomp
 - 8305664: [BACKOUT] (fs) Remove FileSystem support for resolving against a default directory (chdir configuration)
 - 8305596: (fc) Two java/nio/channels tests fail after JDK-8303260
 - 8304982: Emit warning for removal of `COMPAT` provider
 - 8305107: Emoji related binary properties in RegEx
 - 8305591: Cleanup use of `newline` flag in DocCommentParser
 - 8305620: Missing `break` in DocCommentParser `inlineWord()`
 - 8305659: ProblemList com/sun/jdi/PopAndInvokeTest.java with virtual threads
 - ... and 92 more: https://git.openjdk.org/shenandoah/compare/d6df935b...0533c1f7

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

Changes: https://git.openjdk.org/shenandoah/pull/249/files
  Stats: 19830 lines in 495 files changed: 9457 ins; 8591 del; 1782 mod
  Patch: https://git.openjdk.org/shenandoah/pull/249.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah.git pull/249/head:pull/249

PR: https://git.openjdk.org/shenandoah/pull/249