RFR: 8296401: ConcurrentHashTable::bulk_delete might miss to delete some objects [v4]

[Leo Korinth]

On Fri, 9 Dec 2022 16:01:32 GMT, Leo Korinth <lkorinth at openjdk.org> wrote:

>> ConcurrentHashTable::bulk_delete might miss to delete some objects if a bucket has more than 256 entries. Current uses of ConcurrentHashTable are not harmed by this behaviour. 
>> 
>> I modified gtest:ConcurrentHashTable to detect the problem (first commit), and fixed the problem in the code (second commit).
>> 
>> Tests passes tier1-3.
>
> Leo Korinth has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - renam stack limit, and add comments
>  - Make ndel a reference to a pointer so that we can poison it. Also fix
>    POISON_PTR to be of correct type (the pointer is const, not the memory
>    pointed to).

I will fix the build issue.

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PR: https://git.openjdk.org/jdk/pull/10983