8222502: Replace 19,20 case alternatives with JVM_CONSTANT_Module/Package names
Summary: Add JVM_CONSTANT_Module and JVM_CONSTANT_Package to classfile_constants.h
Reviewed-by: coleenp, hseigel
Welcome to the JDK!
===================
For information about building the JDK, including how to retrieve all
of the source code, please see either of these files:
* doc/building.html (html version)
* doc/building.md (markdown version)
See http://openjdk.java.net/ for more information about the OpenJDK
Community and the JDK.