[jdk20u] RFR: 8306734: Shenandoah: Missing barriers on deoptimization path

[Aleksey Shipilev]

Clean backport to fix the recent regression introduced in 20u.

Testing:
 - [x] Reproducer from the bug, fails 1/2 times without the fix, passes with a fix
 - [ ] Linux x86_64 fastdebug `hotspot_gc_shenandoah`
 - [ ] Linux AArch64 fastdebug `hotspot_gc_shenandoah`

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Commit messages:
 - Backport 28829f308fe6314388c9a47b91273bcf81eb806c

Changes: https://git.openjdk.org/jdk20u/pull/64/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk20u&pr=64&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306734
  Stats: 26 lines in 1 file changed: 24 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk20u/pull/64.diff
  Fetch: git fetch https://git.openjdk.org/jdk20u.git pull/64/head:pull/64

PR: https://git.openjdk.org/jdk20u/pull/64