RFR: implementation for JEP 334: JVM Constants API

Hi all, Please review the proposed implementation for JEP 334 [1]. The webrev can be found at [2] and the javadoc at [3]. Thanks, Vicente [1] https://bugs.openjdk.java.net/browse/JDK-8203252 [2] http://cr.openjdk.java.net/~vromero/constant.api/webrev.07/constants.api.pat... [3] http://cr.openjdk.java.net/~vromero/constant.api/javadoc.07/overview-summary... PS. We are offering a MacBook Wheel to the authors of the first 5 comments :)