[jdk17u-dev] RFR: 8294538: missing is_unloading() check in SharedRuntime::fixup_callers_callsite()

[Goetz Lindenmaier]

I backport this for parity with 17.0.7-oracle.

Locally, the patch applied clean, but the /backport command did not manage to apply this.

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Commit messages:
 - Backport b5efa2afe268e3171f54d8488ef69bf67059bd7f

Changes: https://git.openjdk.org/jdk17u-dev/pull/1021/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1021&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/jdk17u-dev/pull/1021.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/1021/head:pull/1021

PR: https://git.openjdk.org/jdk17u-dev/pull/1021