RFR: 8356941: AbstractMethodError in HotSpot Due to Incorrect Handling of Private Method

[David Holmes]

Private methods should never be considered as the implementation of a default method.

The first commit adds some additional logging I used to track down what was happening. I like it, but if reviewers think it too much I can drop it.

The second commit is the actual fix to exclude private methods, and adds the missing test case to the existing defmeth tests.

Testing:
 - tiers 1-4

Thanks

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Commit messages:
 - Merge branch 'master' into 8356941-defaultmeth
 - Fix bug and add new testcases
 - Additional logging to identify the problem

Changes: https://git.openjdk.org/jdk/pull/26302/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26302&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8356941
  Stats: 58 lines in 2 files changed: 56 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/26302.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26302/head:pull/26302

PR: https://git.openjdk.org/jdk/pull/26302