RFR: 8266857: PipedOutputStream.sink should be volatile [v2]

[Liam Miller-Cushon]

> 8266857: PipedOutputStream.sink should be volatile

Liam Miller-Cushon has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  8266857: PipedOutputStream.sink should be volatile

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3960/files
  - new: https://git.openjdk.java.net/jdk/pull/3960/files/4093362f..05795385

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3960&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3960&range=00-01

  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3960.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3960/head:pull/3960

PR: https://git.openjdk.java.net/jdk/pull/3960