[jdk26] RFR: 8373630: r18_tls should not be modified on Windows AArch64

[duke]

On Fri, 19 Dec 2025 19:23:09 GMT, Saint Wesonga <swesonga at openjdk.org> wrote:

> This pull request is a backport of commit [a0dd66f9](https://github.com/openjdk/jdk/commit/a0dd66f92d7f8400b9800847e36d036315628afb)

@swesonga 
Your change (at version a23ee3671faad633f004c86f19f6aceb8dd5a021) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk/pull/28933#issuecomment-3677946496