[lworld] RFR: Merge jdk

[David Simms]

Merge jdk-26+1

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Commit messages:
 - Version flick
 - Merge jdk
 - 8357396: Refactor nmethod::make_not_entrant to use Enum instead of "const char*"
 - 8355746: Start of release updates for JDK 26

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - lworld: https://webrevs.openjdk.org/?repo=valhalla&pr=1561&range=00.0
 - jdk: https://webrevs.openjdk.org/?repo=valhalla&pr=1561&range=00.1

Changes: https://git.openjdk.org/valhalla/pull/1561/files
  Stats: 2050 lines in 100 files changed: 1827 ins; 22 del; 201 mod
  Patch: https://git.openjdk.org/valhalla/pull/1561.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1561/head:pull/1561

PR: https://git.openjdk.org/valhalla/pull/1561