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

[Markus KARG]

On Sat, 16 Dec 2023 17:13:17 GMT, Chen Liang <liach at openjdk.org> wrote:

>>> If we drop the method for now I have to write it later again, I guess
>> 
>> Maybe, but it's archived so it's easy enough.
>
> If this is only used after Module system is ready, we can use something like:
> https://github.com/openjdk/jdk/blob/34351b7a7950a3b563748f40f2619374f62f9b16/src/java.base/share/classes/java/nio/file/Files.java#L3352
> 
> 
> if (out.getClass().getModule() == Object.class.getModule())

I propose we simply go with the original solution, so we stay sync with BAIS.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16879#discussion_r1428872747