RFR: 8291056: Remove unused Generation::par_promote*()

[Kim Barrett]

On Tue, 26 Jul 2022 19:26:27 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> Please review this trivial cleanup to remove unused Generation::par_promote() and Generation::par_promote_alloc_done() methods.

Looks good, and trivial.

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Marked as reviewed by kbarrett (Reviewer).

PR: https://git.openjdk.org/jdk/pull/9648