[jdk25u] RFR: 8357396: Refactor nmethod::make_not_entrant to use Enum instead of "const char*" [v2]

[Cesar Soares Lucas]

> Hi all,
> 
> This pull request contains a backport of commit [62fde687](https://github.com/openjdk/jdk/commit/62fde687088ce72ef33b94e73babf4bfe1395c17) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Cesar Soares Lucas on 5 Jun 2025 and was reviewed by Manuel Hässig and Aleksey Shipilev.
> 
> Thanks!

Cesar Soares Lucas has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge remote-tracking branch 'upstream/master' into backport-JohnTortugo-62fde687-master
 - Backport 62fde687088ce72ef33b94e73babf4bfe1395c17

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

Changes:
  - all: https://git.openjdk.org/jdk25u/pull/259/files
  - new: https://git.openjdk.org/jdk25u/pull/259/files/7b7aa36f..29931e9d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk25u&pr=259&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk25u&pr=259&range=00-01

  Stats: 6268 lines in 167 files changed: 4172 ins; 1379 del; 717 mod
  Patch: https://git.openjdk.org/jdk25u/pull/259.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/259/head:pull/259

PR: https://git.openjdk.org/jdk25u/pull/259