RFR: 8263233: Update java.net and java.nio to use instanceof pattern variable [v2]

[Patrick Concannon]

> Hi,
> 
> Could someone please review my code for updating the code in the `java.net` and `java.nio` packages 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:

  8263233: Small refactor of equals method in java/net/InterfaceAddress; removed superfluous whitespace in java/net/Inet6Address

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2890/files
  - new: https://git.openjdk.java.net/jdk/pull/2890/files/b204a44a..eca90955

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2890&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2890&range=00-01

  Stats: 8 lines in 2 files changed: 0 ins; 4 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2890.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2890/head:pull/2890

PR: https://git.openjdk.java.net/jdk/pull/2890