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

[Andrew Haley]

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)

Marked as reviewed by aph (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28933#pullrequestreview-3600940979