[jdk19u] RFR: 8294538: missing is_unloading() check in SharedRuntime::fixup_callers_callsite()

[Tobias Hartmann]

Backport of [JDK-8294538](https://bugs.openjdk.java.net/browse/JDK-8294538). Applies cleanly. Approval is pending.

Thanks,
Tobias

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Commit messages:
 - 8294538: missing is_unloading() check in SharedRuntime::fixup_callers_callsite()

Changes: https://git.openjdk.org/jdk19u/pull/81/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19u&pr=81&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294538
  Stats: 22 lines in 3 files changed: 9 ins; 12 del; 1 mod
  Patch: https://git.openjdk.org/jdk19u/pull/81.diff
  Fetch: git fetch https://git.openjdk.org/jdk19u pull/81/head:pull/81

PR: https://git.openjdk.org/jdk19u/pull/81