RFR: 8284638: store skip buffers in InputStream Object [v3]

[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:

  moving nr declaration from the beginning of the method to where it's actually used

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5872/files
  - new: https://git.openjdk.java.net/jdk/pull/5872/files/81e9ca49..85cec668

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5872&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5872&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 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