[Runtime] Handle all generic parameters at once demangling to metadata.
[Runtime] Handle all generic parameters at once demangling to metadata.

When demangling a symbolic reference to a nested generic type, the
demangle-to-metadata path will be given all levels of generic arguments at
once. Cope with this in the demangling-to-metadata path.

Eventually, we would like to switch all clients over to take all
levels of generic arguments at once.

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