RFR: 8306374: (bf) Improve performance of DirectCharBuffer::append(CharSequence[,int,int]) [v3]

[Chen Liang]

On Wed, 19 Apr 2023 16:42:23 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Use `getChars()` to copy characters to an intermediate local `char[]` array and then `putArray()` to copy the chars into the buffer itself.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8306374: Remove superfluous csq == null check

Marked as reviewed by liach (Author).

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PR Review: https://git.openjdk.org/jdk/pull/13522#pullrequestreview-1392477917