RFR: 8278791: Rename ClassLoaderData::holder_phantom

[Coleen Phillimore]

On Tue, 14 Dec 2021 15:15:44 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> Trivial change to change the name of holder_phantom.
> Tested with cds/appcds tests locally.

tier1 on Oracle platforms passed successfully.  Thanks for the code review, Stefan.

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PR: https://git.openjdk.java.net/jdk/pull/6834