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

[Nizar Benalla]

> 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

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/28130/files
  - new: https://git.openjdk.org/jdk/pull/28130/files/b47b9ee9..1237304b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28130&range=08
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28130&range=07-08

  Stats: 49 lines in 4 files changed: 8 ins; 29 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/28130.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28130/head:pull/28130

PR: https://git.openjdk.org/jdk/pull/28130