RFR: Merge openjdk/jdk:master

[William Kemper]

Merges tag jdk-21+9

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Commit messages:
 - Merge tag 'jdk-21+9' into merge-jdk-21-9
 - 8298478: (fs) Path.of should allow input to include long path prefix
 - 8301462: Convert Permission files to use lambda after JDK-8076596
 - 8302072: Parallel: Remove unimplemented ParCompactionManager::stack_push
 - 8301767: Convert virtual thread tests to JUnit
 - 8301828: Avoid unnecessary array fill after creation in javax.swing.text
 - 8302047: G1: Remove unused G1RegionToSpaceMapper::_region_granularity
 - 8301380: jdk/jfr/api/consumer/streaming/TestCrossProcessStreaming.java
 - 8301756: Missed constructor from 8301659
 - 8301862: G1: Remove G1PageBasedVirtualSpace::_executable
 - ... and 100 more: https://git.openjdk.org/shenandoah/compare/d258034d...9b390e23

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=shenandoah&pr=218&range=00.0
 - openjdk/jdk:master: https://webrevs.openjdk.org/?repo=shenandoah&pr=218&range=00.1

Changes: https://git.openjdk.org/shenandoah/pull/218/files
  Stats: 16366 lines in 466 files changed: 9712 ins; 3475 del; 3179 mod
  Patch: https://git.openjdk.org/shenandoah/pull/218.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah pull/218/head:pull/218

PR: https://git.openjdk.org/shenandoah/pull/218