RFR: Merge openjdk/jdk21u-dev:master

[William Kemper]

Merges tag jdk-21.0.6+0

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Commit messages:
 - 8280120: [IR Framework] Add attribute to @IR to enable/disable IR matching based on the architecture
 - 8335409: Can't allocate and retain memory from resource area in frame::oops_interpreted_do oop closure after 8329665
 - 8338286: GHA: Demote x86_32 to hotspot build only
 - 8311306: Test com/sun/management/ThreadMXBean/ThreadCpuTimeArray.java failed: out of expected range
 - 8322881: java/nio/file/Files/CopyMoveVariations.java fails with AccessDeniedException due to permissions of files in /tmp
 - 8335150: Test LogGeneratedClassesTest.java fails on rpmbuild mock enviroment
 - 8336284: Test TestClhsdbJstackLock.java/TestJhsdbJstackLock.java fails with -Xcomp after JDK-8335743
 - 8309894: compiler/vectorapi/VectorLogicalOpIdentityTest.java fails on SVE system with UseSVE=0
 - 8316193: jdk/jfr/event/oldobject/TestListenerLeak.java java.lang.Exception: Could not find leak
 - 8335743: jhsdb jstack cannot print some information on the waiting thread
 - ... and 10 more: https://git.openjdk.org/shenandoah-jdk21u/compare/ed77abd4...33f4d805

The webrev contains the conflicts with master:
 - merge conflicts: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=75&range=00.conflicts

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/75/files
  Stats: 769 lines in 38 files changed: 473 ins; 125 del; 171 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/75.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/75/head:pull/75

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/75