RFR: 8268113: Re-use Long.hashCode() where possible [v6]

[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().

Сергей Цыпанов has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:

 - Merge branch 'master' into 8268113
 - Merge branch 'master' into 8268113
 - Merge branch 'master' into 8268113
 - 8268113: Inline local vars where reasonable
 - 8268113: Delegate to Double.hashCode()
 - 8268113: Re-use Long.hashCode() where possible

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4309/files
  - new: https://git.openjdk.java.net/jdk/pull/4309/files/76af35c6..3a7b5515

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4309&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4309&range=04-05

  Stats: 5577 lines in 149 files changed: 3466 ins; 1405 del; 706 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