RFR: 8284638: store skip buffers in InputStream Object [v7]

[XenoAmess]

> @jmehrens what about this then?
> I think it safe now(actually this mechanism is learned from Reader)

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

  change to liach operation.

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5872/files
  - new: https://git.openjdk.java.net/jdk/pull/5872/files/1f6e0eb7..9854f523

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5872&range=06
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5872&range=05-06

  Stats: 22 lines in 2 files changed: 14 ins; 5 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5872.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5872/head:pull/5872

PR: https://git.openjdk.java.net/jdk/pull/5872