RFR: 8320971: Use BufferedInputStream.buf directly when param of implTransferTo() is trusted [v15]

[Brian Burkhalter]

On Tue, 19 Dec 2023 10:14:44 GMT, Sergey Tsypanov <stsypanov at openjdk.org> wrote:

> Shouldn't we keep at least the method for the classes checked in `BIS.isTrusted()`

You can keep it there or inline it. As Alan noted, the main thing is not to add something like a new package.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16879#discussion_r1431779354