RFR: 8272297: FileInputStream should override transferTo() for better performance

[Brian Burkhalter]

Please consider this request to add an override `java.io.FileInputStream.transferTo(OutputStream)` with improved performance if the parameter is a `FileOutputStream`.

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Commit messages:
 - 8272297: FileInputStream should override transferTo() for better performance

Changes: https://git.openjdk.java.net/jdk/pull/5097/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5097&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272297
  Stats: 21 lines in 1 file changed: 21 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5097.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5097/head:pull/5097

PR: https://git.openjdk.java.net/jdk/pull/5097