[jdk21u-dev] RFR: Merge jdk21u:master

[Goetz Lindenmaier]

Merge build tag 21.0.6-ga from jdk21u to jdk21u-dev

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Commit messages:
 - Merge
 - 8347010: [21u] Remove designator DEFAULT_PROMOTED_VERSION_PRE=ea for release 21.0.6
 - 8339180: Enhanced Building of Processes: Follow-on Issue
 - 8336564: Enhance mask blit functionality redux
 - 8335428: Enhanced Building of Processes
 - 8330045: Enhance array handling

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1351&range=00.0
 - jdk21u:master: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1351&range=00.1

Changes: https://git.openjdk.org/jdk21u-dev/pull/1351/files
  Stats: 90 lines in 4 files changed: 56 ins; 8 del; 26 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1351.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1351/head:pull/1351

PR: https://git.openjdk.org/jdk21u-dev/pull/1351