[jdk21u-dev] RFR: Merge jdk21u:master

[Goetz Lindenmaier]

Merge build tag 21.0.5-ga from jdk21u to jdk21u-dev

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Commit messages:
 - Merge
 - 8341989: [21u] Back out JDK-8327501 and JDK-8328366
 - 8341674: [21u] Remove designator DEFAULT_PROMOTED_VERSION_PRE=ea for release 21.0.5
 - 8332644: Improve graph optimizations
 - 8331446: Improve deserialization support
 - 8328726: Better Kerberos support
 - 8335713: Enhance vectorization analysis
 - 8328544: Improve handling of vectorization
 - 8328286: Enhance HTTP client
 - 8311208: Improve CDS Support
 - ... and 1 more: https://git.openjdk.org/jdk21u-dev/compare/9e582fcb...5f8cfe1d

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1054&range=00.0
 - jdk21u:master: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1054&range=00.1

Changes: https://git.openjdk.org/jdk21u-dev/pull/1054/files
  Stats: 2648 lines in 58 files changed: 2213 ins; 67 del; 368 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1054.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1054/head:pull/1054

PR: https://git.openjdk.org/jdk21u-dev/pull/1054