RFR: 8304502: Classfile API class hierarchy makes assumptions when class is not resolved

[Adam Sotona]

Classfile API class hierarchy makes assumptions when class is not resolved and that may lead to silent generation of invalid stack maps. Only debug-level log information of case is actually provided.

Proposed patch throws IllegalArgumentException when the class is not resolved instead.

Thanks for review.

Adam

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Commit messages:
 - 8304502: Classfile API class hierarchy makes assumptions when class is not resolved

Changes: https://git.openjdk.org/jdk/pull/13099/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13099&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304502
  Stats: 17 lines in 4 files changed: 4 ins; 8 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/13099.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/13099/head:pull/13099

PR: https://git.openjdk.org/jdk/pull/13099