RFR: JDK-8267936: PreserveAllAnnotations option isn't tested

[Jaroslav Tulach]

There doesn't seem to be much support for the complete changes in #4245. To get at least something useful from that endeavor I have extracted the test for existing behavior of `-XX:+PreserveAllAnnotations` and I am offering it in this pull request without any changes to the JVM behavior.

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Commit messages:
 - Test long time existing behavior of -XX:+PreserveAllAnnotations

Changes: https://git.openjdk.java.net/jdk/pull/4280/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4280&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267936
  Stats: 172 lines in 1 file changed: 172 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4280.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4280/head:pull/4280

PR: https://git.openjdk.java.net/jdk/pull/4280