RFR: 8286677: [BACKOUT] (fc) Tune FileChannel.transferFrom()

[Brian Burkhalter]

This reverts commit 986d87dcc0b5d23828d7390be0a61756be1aae6f.

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Commit messages:
 - 8286677: [BACKOUT] (fc) Tune FileChannel.transferFrom()

Changes: https://git.openjdk.java.net/jdk/pull/8688/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8688&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8286677
  Stats: 132 lines in 4 files changed: 0 ins; 117 del; 15 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8688.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8688/head:pull/8688

PR: https://git.openjdk.java.net/jdk/pull/8688