RFR: JDK-8267936: PreserveAllAnnotations option doesn't expose the annotation to Java code [v2]

[Jaroslav Tulach]

> This PR exposes runtime invisible annotations via `Class.getAnnotation` when `-XX:+PreserveAllAnnotations` option is passed to the JVM.
> 
> Existing `-XX:+PreserveAllAnnotations` option can be very useful for code that needs to access annotations with `RetentionPolicy.CLASS` without the need to parse the .class files manually. While the RuntimeInvisibleAnnotations are kept in the runtime, they are not visible via java.lang.reflect API. I assume that's just an omission.
> 
> This PR provides a new test and a fix to make `Class.getAnnotation(...)` useful when `-XX:+PreserveAllAnnotations` option is on.

Jaroslav Tulach has updated the pull request incrementally with one additional commit since the last revision:

  Only expose non RetentionPolicy.RUNTIME annotations when -XX:+PreserveAllAnnotations is specified

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4245/files
  - new: https://git.openjdk.java.net/jdk/pull/4245/files/e1aa800e..699861ef

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4245&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4245&range=00-01

  Stats: 20 lines in 5 files changed: 19 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4245.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4245/head:pull/4245

PR: https://git.openjdk.java.net/jdk/pull/4245