RFR: 8361209: (bf) Use CharSequence::getChars for StringCharBuffer bulk get methods [v3]

[Brian Burkhalter]

On Wed, 16 Jul 2025 22:55:02 GMT, Brett Okken <duke at openjdk.org> wrote:

> #if[char]
>         assert !isAddressable();
> #end[char]

I think you intended `isAddressable()` in the above, not its negation.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26251#discussion_r2211792089