RFR: 8267110: Update java.util to use instanceof pattern variable [v4]

[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 incrementally with one additional commit since the last revision:

  8267110: Reverted changes made to files in java.util.concurrent

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4088/files
  - new: https://git.openjdk.java.net/jdk/pull/4088/files/da615e7d..2c076a55

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4088&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4088&range=02-03

  Stats: 31 lines in 5 files changed: 16 ins; 0 del; 15 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