[jdk21u-dev] RFR: Merge jdk21u:master

[Christoph Langer]

Merge changes of jdk-21.0.4+7

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

Commit messages:
 - Merge tag 'jdk-21.0.4+7'
 - 8335960: [21u] Remove designator DEFAULT_PROMOTED_VERSION_PRE=ea for release 21.0.4
 - 8320548: Improved loop handling
 - 8327413: Enhance compilation efficiency
 - 8324559: Improve 2D image handling
 - 8323390: Enhance mask blit functionality
 - 8323231: Improve array management
 - 8320097: Improve Image transformations
 - 8325600: Better symbol storage
 - 8319859: Better symbol storage
 - ... and 1 more: https://git.openjdk.org/jdk21u-dev/compare/b93ae1af...506379ef

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=848&range=00.0
 - jdk21u:master: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=848&range=00.1

Changes: https://git.openjdk.org/jdk21u-dev/pull/848/files
  Stats: 148 lines in 14 files changed: 87 ins; 4 del; 57 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/848.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/848/head:pull/848

PR: https://git.openjdk.org/jdk21u-dev/pull/848