RFR: 8305811: (bf) Improve heap buffer performance of CharBuffer::append(CharSequence) [v3]

[Alan Bateman]

On Thu, 13 Apr 2023 15:45:06 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Use the `getChars` method of `String`, `StringBuffer`, and `StringBuilder` to load the chars directly into the array of the heap buffer.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8305811: Cleanup to address reviewer comments

Marked as reviewed by alanb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/13415#pullrequestreview-1383745821