RFR: 8376568: Change Thread::getStackTrace to use handshake op for all cases [v4]

[Alan Bateman]

On Thu, 5 Feb 2026 10:44:54 GMT, Serguei Spitsyn <sspitsyn at openjdk.org> wrote:

> Most of new tests need a copyright year update.

The tests are in the repo since 2025, not changed in 2026 so I didn't bump the copyright year.

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PR Comment: https://git.openjdk.org/jdk/pull/29461#issuecomment-3852852215