[jdk25] RFR: 8360679: Shenandoah: AOT saved adapter calls into broken GC barrier stub

[Aleksey Shipilev]

Backports the AOT- Shenandoah- AArch64- specific bugfix for JDK 25 regression. JDK 25 RDP2 approval is pending.

Additional testing:
 - [x] Linux AArch64 server fastdebug, `runtime/cds` with `-XX:+UseShenandoahGC` (now passes)
 - [x] Linux AArch64 server fastdebug, `hotspot_gc_shenandoah` (still passes)

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Commit messages:
 - Backport 8477630970b61e3178abd7ac812ed97e181e2684

Changes: https://git.openjdk.org/jdk/pull/26464/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26464&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8360679
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26464.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26464/head:pull/26464

PR: https://git.openjdk.org/jdk/pull/26464