[jdk18u] RFR: 8285301: C2: assert(!requires_atomic_access) failed: can't ensure atomicity

Tue Jun 21 07:29:55 UTC 2022

Backport of [JDK-8285301](https://bugs.openjdk.java.net/browse/JDK-8285301). Did not apply cleanly due to changes to surrounding code. Approval is pending.

Thanks,
Tobias

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Commit messages:
 - 8285301: C2: assert(!requires_atomic_access) failed: can't ensure atomicity

Changes: https://git.openjdk.org/jdk18u/pull/156/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk18u&pr=156&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8285301
  Stats: 188 lines in 10 files changed: 57 ins; 78 del; 53 mod
  Patch: https://git.openjdk.org/jdk18u/pull/156.diff
  Fetch: git fetch https://git.openjdk.org/jdk18u pull/156/head:pull/156

PR: https://git.openjdk.org/jdk18u/pull/156