RFR: JDK-8320830: Dont mix os::dll_load() with direct dlclose() calls

[Christoph Langer]

On Tue, 28 Nov 2023 11:36:08 GMT, Joachim Kern <jkern at openjdk.org> wrote:

> We should not mix os::dll_load() with dlclose(), but should call os::dll_unload(). At the moment this is benign, but this prevents certain type of platforms specific workarounds inside os::dll_load() and is a prerequisite for these upcoming changes. 
> 
> There are two places I see where this happens, both are AIX specific:
> 
> 
> os/aix/libodm_aix.cpp
> 51: dlclose(_libhandle);
> 58: if (_libhandle) { dlclose(_libhandle); }
> 
> os/aix/libperfstat_aix.cpp
> 117: dlclose(g_libhandle);

Marked as reviewed by clanger (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/16846#pullrequestreview-1754589013