RFR: Merge openjdk/jdk21u-dev:master [v2]

[William Kemper]

> Merges tag jdk-21.0.3+3

William Kemper has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 13 additional commits since the last revision:

 - Merge branch 'shenandoah-21u-master' into merge-jdk-21.0.3+3
 - 8325194: GHA: Add macOS M1 testing
   8325444: GHA: JDK-8325194 causes a regression
   
   Reviewed-by: shade
   Backport-of: d1c82156ba6ede4b798ac15f935289cfcc99d1a0
 - 8324753: [AIX] adjust os_posix after JDK-8318696
   
   Backport-of: 8950d68ddb36d35831fbb4b98969cd0537527070
 - 8323671: DevKit build gcc libraries contain full paths to source location
   
   Backport-of: dd0694b9cbbfa2defdc3b09f86f20f686688cf7b
 - 8323667: Library debug files contain non-reproducible full gcc include paths
   
   Backport-of: 57fad677819ae3142782f811a8fba94b38f5a74c
 - 8318039: GHA: Bump macOS and Xcode versions
   
   Backport-of: 605c9767291ddf1c409c3e805ffb3182899d06c2
 - 8325150: (tz) Update Timezone Data to 2024a
   
   Backport-of: 917838e0a564b1f2cbfb6cc214ccbfd1a237019f
 - 8309109: AArch64: [TESTBUG] compiler/intrinsics/sha/cli/TestUseSHA3IntrinsicsOptionOnSupportedCPU.java fails on Neoverse N2 and V1
   
   Reviewed-by: aph
   Backport-of: afdaa2a3305461538f3a36de2b0b540fe2da9b37
 - 8324637: [aix] Implement support for reporting swap space in jdk.management
   
   Backport-of: 33324a59ccdb220250cb74e15ce13af0e99dcb07
 - 8324598: use mem_unit when working with sysinfo memory and swap related information
   
   Backport-of: 7a798d3cebea0915f8a73af57333b3488c2091af
 - ... and 3 more: https://git.openjdk.org/shenandoah-jdk21u/compare/9eb7842d...3e6fb7a6

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

Changes:
  - all: https://git.openjdk.org/shenandoah-jdk21u/pull/21/files
  - new: https://git.openjdk.org/shenandoah-jdk21u/pull/21/files/b9cf41da..3e6fb7a6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=21&range=01
 - incr: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=21&range=00-01

  Stats: 21984 lines in 221 files changed: 19954 ins; 952 del; 1078 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/21.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/21/head:pull/21

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/21