[jdk22u] RFR: 8322962: Upcall stub might go undetected when freezing frames

[Aleksey Shipilev]

Clean backport to fix interaction between Virtual Threads and FFM.

Additional testing:
 - [x] New regression test fails without the patch, passes with it
 - [x] MacOS AArch64 server fastdebug, `jdk_loom hotspot_loom`

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Commit messages:
 - Backport 93feda3d9a1807422c7f47703358aabd2e8639b8

Changes: https://git.openjdk.org/jdk22u/pull/168/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk22u&pr=168&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322962
  Stats: 34 lines in 6 files changed: 21 ins; 4 del; 9 mod
  Patch: https://git.openjdk.org/jdk22u/pull/168.diff
  Fetch: git fetch https://git.openjdk.org/jdk22u.git pull/168/head:pull/168

PR: https://git.openjdk.org/jdk22u/pull/168