RFR: 8371667: Shenandoah: Re-design alloc request type enum for better efficiency and cleaner code [v2]

[Xiaolong Peng]

On Wed, 12 Nov 2025 16:55:48 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Now that we are doing this... I do wonder if we want to fold `_is_promotion` and `_affiliation` into the same bitset?

I'll take a look today and see if folding `_is_promotion` and `_affiliation` into the same bitset provides benefits we want.

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PR Comment: https://git.openjdk.org/jdk/pull/28247#issuecomment-3523066748