RFR: Merge openjdk/jdk:master

[William Kemper]

Merges tag jdk-24+21

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Commit messages:
 - 8342681: TestLoadBypassesNullCheck.java fails improperly specified VM option
 - 8342609: jpackage test helper function incorrectly removes a directory instead of its contents only
 - 8342715: x86 unused orw instruction encoding could be removed
 - 8342011: Conditionally compile ReservedHeapSpace compressed heap support
 - 8338570: sun/font/HBShaper - mismatch in return type of FFM upcall function description and native invocation
 - 8340477: Remove JDK1.1 compatible behavior for "EST", "MST", and "HST" time zones
 - 8342698: Fix order of @param tags in module java.base
 - 8335271: Specify the MessageFormat ArgumentIndex Implementation Limit
 - 8339507: Test generation tool and gtest for testing APX encoding of extended gpr instructions
 - 8342376: More reliable OOM handling in ExceptionDuringDumpAtObjectsInitPhase test
 - ... and 52 more: https://git.openjdk.org/shenandoah/compare/7a64fbbb...8bcd4920

The webrev contains the conflicts with master:
 - merge conflicts: https://webrevs.openjdk.org/?repo=shenandoah&pr=528&range=00.conflicts

Changes: https://git.openjdk.org/shenandoah/pull/528/files
  Stats: 94693 lines in 422 files changed: 92101 ins; 1977 del; 615 mod
  Patch: https://git.openjdk.org/shenandoah/pull/528.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah.git pull/528/head:pull/528

PR: https://git.openjdk.org/shenandoah/pull/528