RFR: 8307907: [ppc] Remove RTM locking implementation [v2]

Tue Jun 13 14:15:43 UTC 2023

On Fri, 9 Jun 2023 18:25:30 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> This PR removes RTM code for PPC64. The instructions are not supported by Power10 processors.
>> The situation is even worse in Power9 compatibility mode on Power10. The VM detects RTM to be available, but the processor is unable to complete any transaction successfully.
>> The feature had so many problems and we never supported it in production.
>
> Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove RTM from feature string. Otherwise, tests complain about it.

LGTM.
Maybe a release note would be nice because the change removed product flags.

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Marked as reviewed by mbaesken (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/14398#pullrequestreview-1477287581