RFR: 8267110: Update java.util to use instanceof pattern variable [v5]

[Patrick Concannon]

> Hi,
> 
> Could someone please review my code for updating the code in the `java.util` package to make use of the `instanceof` pattern variable?
> 
> Kind regards,
> Patrick

Patrick Concannon 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 remote-tracking branch 'origin/master' into JDK-8267110
 - 8267110: Reverted changes made to files in java.util.concurrent
 - Merge remote-tracking branch 'origin/master' into JDK-8267110
 - 8267110: Reverted changes in java/util/Formatter as primitive to boxed types may have semantic/performance implications
 - Merge remote-tracking branch 'origin/master' into JDK-8267110
 - 8267110: Update java.util to use instanceof pattern variable

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4088/files
  - new: https://git.openjdk.java.net/jdk/pull/4088/files/2c076a55..9bca9400

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4088&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4088&range=03-04

  Stats: 1931 lines in 65 files changed: 1061 ins; 429 del; 441 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4088.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4088/head:pull/4088

PR: https://git.openjdk.java.net/jdk/pull/4088