Fix 12919 - summon anonymous mirror when companion is a case object #14986
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closes #12919
closes #15101
There were two alternatives to solve this:
The first option will result in less code generation, however it will change the parent types of the companion from
Mirror.Singleton
to eitherMirror.Product
orMirror.Sum
(and change signatures offromProduct
orordinal
in the companion), the second option will result in more code generation, but will preserve the signatures of the companion in bytecode for existing code.