[jdk17u] RFR: 8223923: C2: Missing interference with mismatched unsafe accesses

[Tobias Hartmann]

Backport of [JDK-8223923](https://bugs.openjdk.java.net/browse/JDK-8223923). Applies cleanly. Approval is pending.

Thanks,
Tobias

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Commit messages:
 - 8223923: C2: Missing interference with mismatched unsafe accesses

Changes: https://git.openjdk.java.net/jdk17u/pull/104/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=104&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8223923
  Stats: 84 lines in 2 files changed: 76 ins; 2 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/104.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/104/head:pull/104

PR: https://git.openjdk.java.net/jdk17u/pull/104