RFR: 8275840: Add test to java/nio/channels/Channels/TransferTo.java to test transfer sizes > 2GB [v4]

[Alan Bateman]

On Mon, 1 Nov 2021 18:37:39 GMT, Markus KARG <duke at openjdk.java.net> wrote:

>> Testing `FileChannel.transferTo(FileChannel)` with more than 2 GB of data is covering the case that *multiple* iterations of `FileChannel.transferTo(FileChannel)` are actually performed by the test.
>> 
>> This change was requested Alan Bateman @AlanBateman.
>
> Markus KARG has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Indentation

We'll need to update testMoreThanTwoGB to delete the temporary files, otherwise it will file up the file system.

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PR: https://git.openjdk.java.net/jdk/pull/6093