RFR (XS) JDK-8222502: Replace 19,20 case alternatives with JVM_CONSTANT_Module/Package names

[coleen.phillimore at oracle.com]

Lois,
Thank you for fixing this!  Looks good.
Coleen

On 4/22/19 11:18 AM, Lois Foltan wrote:
> Please review the following change to add JVM_CONSTANT_Module and 
> JVM_CONSTANT_Package to classfile_constants.h and use these constant 
> types instead of hard coded 19 & 20 within ClassFileParser.
>
> open webrev at: 
> http://cr.openjdk.java.net/~lfoltan/bug_jdk8222502.0/webrev/
> bug link: https://bugs.openjdk.java.net/browse/JDK-8222502 
> <https://bugs.openjdk.java.net/browse/JDK-8222502>
>
> Testing: hs-tier1-3, jdk-tier1-3
>
> Thanks,
> Lois