RFR: 8370890: Start of release updates for JDK 27 [v9]

[Iris Clark]

On Tue, 2 Dec 2025 15:07:11 GMT, Nizar Benalla <nbenalla at openjdk.org> wrote:

>> Get JDK 27 underway.
>
> Nizar Benalla has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - revert changes to avoid conflict
>  - add 27 to the acceptable boot versions

Marked as reviewed by iris (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28130#pullrequestreview-3532863059