[jdk16u] Integrated: 8260009: InstanceKlass::has_as_permitted_subclass() fails if subclass was redefined

[Harold Seigel]

The patch for JDK-8260009 bug fix applied cleanly.

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Commit messages:
 - Backport f928265e81326a576619719831dc96d95eb135a8

Changes: https://git.openjdk.java.net/jdk16u/pull/8/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16u&pr=8&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8260009
  Stats: 145 lines in 2 files changed: 130 ins; 11 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk16u/pull/8.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16u pull/8/head:pull/8

PR: https://git.openjdk.java.net/jdk16u/pull/8