[lworld] RFR: Merge jdk

[David Simms]

Merge jdk-22+15

-------------

Commit messages:
 - Logical merge errors
 - Merge tag 'jdk-22+15' into lworld_merge_jdk_22_15
 - 6228794: java.text.ChoiceFormat pattern behavior is not well documented.
 - 8314226: Series of colon-style fallthrough switch cases with guards compiled incorrectly
 - 8316087: Test SignedLoggerFinderTest.java is still failing
 - 8315934: RISC-V: Disable conservative fences per vendor
 - 8316021: Serial: Remove unused Generation::post_compact
 - 8316050: Use hexadecimal encoding in MemorySegment::toString
 - 8314612: TestUnorderedReduction.java fails with -XX:MaxVectorSize=32 and -XX:+AlignVector
 - 8311207: Cleanup for Optimization for UUID.toString
 - ... and 92 more: https://git.openjdk.org/valhalla/compare/24e0c059...590858ba

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - lworld: https://webrevs.openjdk.org/?repo=valhalla&pr=955&range=00.0
 - jdk: https://webrevs.openjdk.org/?repo=valhalla&pr=955&range=00.1

Changes: https://git.openjdk.org/valhalla/pull/955/files
  Stats: 24501 lines in 1389 files changed: 12062 ins; 8357 del; 4082 mod
  Patch: https://git.openjdk.org/valhalla/pull/955.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/955/head:pull/955

PR: https://git.openjdk.org/valhalla/pull/955