RFR: 5041655: (ch) FileLock: negative param and overflow issues [v6]

[Brian Burkhalter]

> Add an implementation note to `java.nio.channels.FileLock.overlaps(long,long)` indicating that the method does not check its parameters. Adding such checks would be an incompatible change.

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

  5041655: Update spec of zero lock size in channels and remove from FileLock spec

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7254/files
  - new: https://git.openjdk.java.net/jdk/pull/7254/files/d1001cc6..1e124575

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7254&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7254&range=04-05

  Stats: 21 lines in 3 files changed: 10 ins; 3 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7254.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7254/head:pull/7254

PR: https://git.openjdk.java.net/jdk/pull/7254