RFR: 8264548: Dependencies: ClassHierarchyWalker::is_witness() cleanups

[Vladimir Ivanov]

On Wed, 31 Mar 2021 22:05:20 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Simplify `ClassHierarchyWalker::is_witness()`.
>> 
>> Testing: hs-tier1 - hs-tier4.
>
> Looks like it has changes from: https://git.openjdk.java.net/jdk/pull/3293

I created it as a dependent PR. 

I think that's the way it works (https://github.com/openjdk/skara/pull/1087 which was used as an example in [1] looks similar). 

[1] https://mail.openjdk.java.net/pipermail/jdk-dev/2021-March/005232.html

-------------

PR: https://git.openjdk.java.net/jdk/pull/3297