<i18n dev> RFR: 8268113: Re-use Long.hashCode() where possible

[Сергей Цыпанов]

There is a few JDK classes duplicating the contents of Long.hashCode() for hash code calculation. They should explicitly delegate to Long.hashCode().

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Commit messages:
 - 8268113: Re-use Long.hashCode() where possible

Changes: https://git.openjdk.java.net/jdk/pull/4309/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4309&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268113
  Stats: 10 lines in 7 files changed: 1 ins; 0 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4309.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4309/head:pull/4309

PR: https://git.openjdk.java.net/jdk/pull/4309