RFR: 8036580: CHA: improve default method support

[openjdk-notifier [bot]]

On Wed, 26 May 2021 22:48:15 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

> Enable CHA to look for unique concrete methods under default interface methods.
> Only vtable-based implementation is affected. Old implementation is left as is.
> 
> The unit test requires #4211/#4212 to pass and relies on test code refactorings from #4213.
> 
> Testing:
> - [x] hs-tier1 - hs-tier9

The dependent pull request has now been integrated, and the target branch of this pull request has been updated. This means that changes from the dependent pull request can start to show up as belonging to this pull request, which may be confusing for reviewers. To remedy this situation, simply merge the latest changes from the new target branch into this pull request by running commands similar to these in the local repository for your personal fork:


git checkout 8065760.cha_abstract
git fetch https://git.openjdk.java.net/jdk master
git merge FETCH_HEAD
# if there are conflicts, follow the instructions given by git merge
git commit -m "Merge master"
git push

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PR: https://git.openjdk.java.net/jdk/pull/4214