RFR: Merge openjdk/jdk21u-dev:master

[William Kemper]

Merges tag jdk-21.0.5+2

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Commit messages:
 - 8333622: ubsan: relocInfo_x86.cpp:101:56: runtime error: pointer index expression with base (-1) overflowed
 - 8321509: False positive in get_trampoline fast path causes crash
 - 8331731: ubsan: relocInfo.cpp:155:30: runtime error: applying non-zero offset to null pointer
 - 8335493: check_gc_overhead_limit should reset SoftRefPolicy::_should_clear_all_soft_refs
 - 8331854: ubsan: copy.hpp:218:10: runtime error: addition of unsigned offset to 0x7fc2b4024518 overflowed to 0x7fc2b4024510
 - 8336301: test/jdk/java/nio/channels/AsyncCloseAndInterrupt.java leaves around a FIFO file upon test completion
 - 8324808: Manual printer tests have no Pass/Fail buttons, instructions close set 3
 - 8317112: Add screenshot for Frame/DefaultSizeTest.java
 - 8335967: "text-decoration: none" does not work with "A" HTML tags
 - 8324580: SIGFPE on THP initialization on kernels < 4.10
 - ... and 280 more: https://git.openjdk.org/shenandoah-jdk21u/compare/a0b3c6cd...dac39de0

The webrev contains the conflicts with master:
 - merge conflicts: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=71&range=00.conflicts

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/71/files
  Stats: 49854 lines in 843 files changed: 29467 ins; 15795 del; 4592 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/71.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/71/head:pull/71

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/71