RFR: 8344339: GenShen: Avoid using namespaces

[Aleksey Shipilev]

On Fri, 15 Nov 2024 23:08:13 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Namespaces are contrary to hotspot style guide: https://github.com/openjdk/jdk/blob/master/doc/hotspot-style.md#namespaces

Marked as reviewed by shade (Committer).

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PR Review: https://git.openjdk.org/shenandoah/pull/542#pullrequestreview-2442173932