RFR: 8205502: Make exception message from AnnotationInvocationHandler more informative

[Brian Burkhalter]

On Thu, 1 Apr 2021 22:15:01 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> Simple change to make the exception/error messages more informative for various malformed annotation situations.

Looks fine.

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Marked as reviewed by bpb (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/3317