[jdk11u-dev] RFR: 8212718: Refactor some annotation processor tests to better use collections

[Christoph Langer]

Hi all,

this pull request contains a backport of JDK-8212718 from the openjdk/jdk repository.

The commit being backported was authored by Joe Darcy on 23 Oct 2018 and was reviewed by Jim Laskey and Vicente Romero.

Thanks!

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Commit messages:
 - Backport 34397c4914925b990a5d74a238b01bb05d5b7c44

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/291/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=291&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8212718
  Stats: 24 lines in 2 files changed: 2 ins; 11 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/291.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/291/head:pull/291

PR: https://git.openjdk.java.net/jdk11u-dev/pull/291