RFR: 8296431 - PushbackInputStream should override transferTo [v2]

[Markus KARG]

> This PR implements JDK-8296431

Markus KARG has updated the pull request incrementally with one additional commit since the last revision:

  fixed wrong bug number

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10999/files
  - new: https://git.openjdk.org/jdk/pull/10999/files/26b3515c..9d387eaa

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10999&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10999&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10999.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10999/head:pull/10999

PR: https://git.openjdk.org/jdk/pull/10999