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

[Brian Burkhalter]

On Wed, 16 Jul 2025 15:45:25 GMT, Brett Okken <duke at openjdk.org> wrote:

> Perhaps an assert statement instead to avoid any future modification breaking the assumption?

I added an `assert` in 3c88dac but I am not entirely sure it's the one you had in mind.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26251#discussion_r2211718015