RFR: 8307104: [AIX] VM crashes with UseRTMLocking on Power10

[Christoph Langer]

On Fri, 28 Apr 2023 13:13:41 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> We need to prevent usage of transactional memory (UseRTMLocking) on Power10 which doesn't support it. The VM crashes with SIGILL on AIX when trying to use it.
> 
> I'm also changing the AIX specific check for the case in which somebody uses Power10 with -XX:PowerArchitecturePPC64=8 (or 9).
> The Linux specific code is fine as it is.
> 
> This change is small and should get considered for backports. We may remove the RTM code completely for future JDKs.

LGTM

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

Marked as reviewed by clanger (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/13717#pullrequestreview-1406043852