RFR: 8264734: Some SA classes could use better hashCode() implementation [v4]

[Mitsuru kariya]

> The current `hashCode` implementation of SA's Address subclasses ignores the upper 32 bits of the long value.
> This PR changes to use `Long.hashCode` instead.

Mitsuru kariya has updated the pull request incrementally with one additional commit since the last revision:

  Update copyright

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3522/files
  - new: https://git.openjdk.java.net/jdk/pull/3522/files/ac5c2660..71b663cd

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3522&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3522&range=02-03

  Stats: 3 lines in 3 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3522.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3522/head:pull/3522

PR: https://git.openjdk.java.net/jdk/pull/3522