RFR: 8269303: Remove unnecessary forward declaration of PSPromotionManager in cpCache.hpp

[Zhengyu Gu]

On Thu, 24 Jun 2021 20:52:58 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Looks good, and trivial.

Thanks @kimbarrett

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PR: https://git.openjdk.java.net/jdk/pull/4585