RFR: 8284638: store skip buffers in InputStream Object [v6]

[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:

  refine jmh

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5872/files
  - new: https://git.openjdk.java.net/jdk/pull/5872/files/738991c0..1f6e0eb7

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5872&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5872&range=04-05

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