RFR: 8263358: Update java.lang to use instanceof pattern variable [v3]

[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 incrementally with one additional commit since the last revision:

  8263358: Refactored equals methods

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2913/files
  - new: https://git.openjdk.java.net/jdk/pull/2913/files/d5bcd253..e9d91315

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2913&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2913&range=01-02

  Stats: 59 lines in 9 files changed: 2 ins; 16 del; 41 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