RFR: 8284638: store skip buffers in InputStream Object [v15]

[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:

  invert if; refine javadoc.

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5872/files
  - new: https://git.openjdk.java.net/jdk/pull/5872/files/d082eae4..cdc4e579

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5872&range=14
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5872&range=13-14

  Stats: 8 lines in 1 file changed: 5 ins; 1 del; 2 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