RFR: JDK-8267936: PreserveAllAnnotations option doesn't expose the annotation to Java code [v3]

[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 two additional commits since the last revision:

 - Merging with test for long time existing behavior of -XX:+PreserveAllAnnotations
 - Test long time existing behavior of -XX:+PreserveAllAnnotations

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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/699861ef..9548a565

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4245&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4245&range=01-02

  Stats: 172 lines in 1 file changed: 172 ins; 0 del; 0 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