RFR: 8278268 - (ch) InputStream returned by Channels.newInputStream should have fast path for FileChannel targets [v17]

[Markus KARG]

> This sub-issue defines the work to be done to implement JDK-8265891 solely for the particular case of FileChannel.transferFrom(ReadableByteChannel), including special treatment of SelectableByteChannel.

Markus KARG has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:

  Implementing 8278268
  
  Signed-off-by: Markus Karg <markus at headcrashing.eu>

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Changes: https://git.openjdk.org/jdk/pull/6711/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=6711&range=16
  Stats: 804 lines in 6 files changed: 574 ins; 199 del; 31 mod
  Patch: https://git.openjdk.org/jdk/pull/6711.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/6711/head:pull/6711

PR: https://git.openjdk.org/jdk/pull/6711