RFR: 8357821: Revert incorrectly named JavaLangAccess::unchecked* methods

[Per Minborg]

On Tue, 3 Jun 2025 09:10:04 GMT, Volkan Yazici <vyazici at openjdk.org> wrote:

> > I wonder if we should add that implementations of the affected method _shall_ do bounds checking to reduce the likelihood of a new/updated native implementation miss that?
> 
> @minborg, would you mind elaborating on this a bit, please? Do you imply adding an `@implSpec` to the touched `JavaLangAccess` methods?

Yes, I think that would be a good thing to do.

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PR Comment: https://git.openjdk.org/jdk/pull/25545#issuecomment-2939694237