RFR: 8261657: [PPC64] Cleanup StoreCM nodes after CMS removal

[Lutz Schmidt]

On Fri, 12 Feb 2021 16:29:36 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> We only need one StoreCM node after CMS removal. CMS StoreStore barriers were already removed at other places.

Changes look good to me. 
Thanks for cleaning up!

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Marked as reviewed by lucy (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2554