[jdk11u-dev] RFR: 8215575: C2 crash: assert(get_instanceKlass()->is_loaded()) failed: must be at least loaded

[Matthias Baesken]

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Commit messages:
 - Backport cab9667f411b363c8b68dc17fc85a397c8c3aeb6

Changes: https://git.openjdk.org/jdk11u-dev/pull/1814/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1814&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8215575
  Stats: 20 lines in 3 files changed: 7 ins; 8 del; 5 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1814.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1814/head:pull/1814

PR: https://git.openjdk.org/jdk11u-dev/pull/1814