RFR: 8309937: Add @sealedGraph for some Panama FFM interfaces

Mon Jun 19 15:05:36 UTC 2023

Hi all,

This pull request contains a backport of commit [b412fc79](https://github.com/openjdk/jdk/commit/b412fc79c3c2548df10918090beedaf6b2d08d96) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Per Minborg on 16 Jun 2023 and was reviewed by Maurizio Cimadamore.

Thanks!

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Commit messages:
 - Backport b412fc79c3c2548df10918090beedaf6b2d08d96

Changes: https://git.openjdk.org/jdk21/pull/34/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=34&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309937
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21/pull/34.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/34/head:pull/34

PR: https://git.openjdk.org/jdk21/pull/34