RFR: 8292170: Convert CodeRootSetTable to use ResourceHashtable

[Leo Korinth]

On Wed, 14 Dec 2022 13:45:51 GMT, Leo Korinth <lkorinth at openjdk.org> wrote:

> I am replacing the old hash table with ResourceHashtable. In the process I am also removing the redundant `_length` field. By removing the `_length` field, a lot of asserts can be removed as the length will trivially match the length of the underlying table.
> 
> I would like to have feedback on the addition of `unlink_destruct(Function&& should_remove)`. I added it because I prefer to use a functor object that can be used by lambdas instead of an iterator object. However, I did add code to "destruct" resource objects when they are removed instead of just letting them be to reflect that we use `delete` on c-heap objects. Maybe I should remove this "improvement" and then maybe implement the function by calling the existing unlink?

I changed the code to use the original iterator interface and made the closure NONCOPYABLE. Also updated copyrights.

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

PR: https://git.openjdk.org/jdk/pull/11675