Integrated: 8307907: [ppc] Remove RTM locking implementation

[Martin Doerr]

On Fri, 9 Jun 2023 16:32:44 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.

This pull request has now been integrated.

Changeset: de8aca27
Author:    Martin Doerr <mdoerr at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/de8aca27ba87427307186ffd25c029b5c6dbc82e
Stats:     864 lines in 15 files changed: 0 ins; 842 del; 22 mod

8307907: [ppc] Remove RTM locking implementation

Reviewed-by: mbaesken, rrich, stuefe

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PR: https://git.openjdk.org/jdk/pull/14398