RFR: 8326941: Remove StringUTF16::isBigEndian

[Per Minborg]

On Mon, 18 Mar 2024 14:35:06 GMT, Claes Redestad <redestad at openjdk.org> wrote:

> Does this change how early `Unsafe` is initialized, and does it in turn have dependencies on `StringUTF16`? `StringUTF16` is loaded very early, especially if `-XX:-CompactStrings` is supplied and I would assume the only reason this was added in the first place was to avoid some bootstrapping issue.

I am unsure of the initialization order. Unsafe was added 2015, a few weeks before the explicit C code was added. This might indicate the previous solution was deliberate or it might be the case, the new method was not known by the author at the time.

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PR Comment: https://git.openjdk.org/jdk/pull/18348#issuecomment-2004235134