RFR: 8326941: Remove StringUTF16::isBigEndian

[Roger Riggs]

On Mon, 18 Mar 2024 14:09:09 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposes to remove the native method `StringUTF16::isBigEndian` and its corresponding C implementation and instead rely on the `jdk.internal.misc.Unsafe::isBigEndian` method.

Nice Cleanup.

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Marked as reviewed by rriggs (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/18348#pullrequestreview-1943235796