RFR: 8263358: Update java.lang to use instanceof pattern variable [v4]

[Patrick Concannon]

> Hi,
> 
> Could someone please review my code for updating the code in the `java.lang` 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 four additional commits since the last revision:

 - Merge remote-tracking branch 'origin/master' into JDK-8263358
 - 8263358: Refactored equals methods
 - Merge remote-tracking branch 'origin/master' into JDK-8263358
 - 8263358: Update java.lang to use instanceof pattern variable

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2913/files
  - new: https://git.openjdk.java.net/jdk/pull/2913/files/e9d91315..071fe1eb

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2913&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2913&range=02-03

  Stats: 24696 lines in 1136 files changed: 20879 ins; 1644 del; 2173 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2913.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2913/head:pull/2913

PR: https://git.openjdk.java.net/jdk/pull/2913