[m-rev.] for review: mlds_enum_class_defn

[Zoltan Somogyi]

For review by anyone. The diff is with -b. I have
bootchecked the diff in hlc.gc, java and csharp grades.

Does anyone know what the intention was behind creating
the never-written-out field variable in enum classes? And would
anyone object to deleting it?

Zoltan.
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