RFR: 8265426: Update java.security to use instanceof pattern variable [v2]

[Patrick Concannon]

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

 - Merge remote-tracking branch 'origin/master' into JDK-8265426
 - 8265426: Update java.security to use instanceof pattern variable

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3687/files
  - new: https://git.openjdk.java.net/jdk/pull/3687/files/d4354248..29308d6e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3687&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3687&range=00-01

  Stats: 499579 lines in 4003 files changed: 17611 ins; 476005 del; 5963 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3687.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3687/head:pull/3687

PR: https://git.openjdk.java.net/jdk/pull/3687