RFR: JDK-8320890: [AIX] Find a better way to mimic dl handle equality [v8]

[Martin Doerr]

On Thu, 21 Dec 2023 09:57:08 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> There will be only few libraries in the list. With this assumption Thomas suggested to use just a simple array.
>
> Let's keep it simple. A linear array of only a few items is easily scanned, probably faster than pointer hopping hash table entries. Not that it matters in any way for the few calls to dlopen.
> 
> Also, avoiding hotspot structures preserves layer integrity (porting_aix does not pull anything from hotspot so far) and prevents initialisation time dependencies. Not sure whether ConcurrentHashTable works before VM init, but with Joachimes current solution, we can call dlopen at any time in VM life.

I don't like introducing unnecessary limitations. Are we sure nobody will ever need more than 1024 handles?
Can't we at least use a GrowableArray or something like that?

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PR Review Comment: https://git.openjdk.org/jdk/pull/16920#discussion_r1433865222