RFR: 8358533: Improve performance of java.io.Reader.readAllLines

[Brian Burkhalter]

On Wed, 18 Jun 2025 00:05:17 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> The throughput of the implementation [...].

The performance comments made [here](https://github.com/openjdk/jdk/pull/25863#issuecomment-2982169343) still apply to the most recent commit.

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PR Comment: https://git.openjdk.org/jdk/pull/25863#issuecomment-3001569294