RFR - 8212975 - ClassDesc should have a full name method

Mon, 04 Feb 2019 07:09:38 -0800 

Please review the webrev below.

Though generally useful for debugging ClassDesc (or using Class::forName), 
ClassDesc::fullDisplayName allows compiler devs to use a ClassDesc directly to 
optimally add classes to the symbol table.

Past:

        ClassDesc cd = ...
        String className = cd.packageName().isEmpty() ? cd.displayName() : 
cd.packageName() + "." + cd.displayName();
        Symbol classSym = names.fromString(className);

Future:

        ClassDesc cd = ...
        String className = cd.fullDisplayName();
        Symbol classSym = names.fromString(className);

JBS: https://bugs.openjdk.java.net/browse/JDK-8212975
webrev: http://cr.openjdk.java.net/~jlaskey/8212975/webrev/index.html

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