RFR: 8366498: Wrong InstanceKlass::cast() in ClassFileParser::parse_super_class

[Ioi Lam]

Please review this small change. 

It affects debug build only, and I am not even sure if `cp->resolved_klass_at()` is ever called. Since we are very early in class file parsing, it's unlikely that any klass entries have been resolved at this point.

Anyway, for correctness, the `InstanceKlass::cast()` should be done after the check for array class.

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Commit messages:
 - 8366498: Wrong InstanceKlass::cast() in ClassFileParser::parse_super_class

Changes: https://git.openjdk.org/jdk/pull/27026/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27026&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366498
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/27026.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27026/head:pull/27026

PR: https://git.openjdk.org/jdk/pull/27026