Jordan Rose cde35430c6 Fix ParameterList::clone to handle deserialized defaults arguments. (#7156) ...

It was checking the wrong predicate, and therefore failing to mark
inherited default arguments as actually being inherited.

While here, explicitly clear out default arguments from non-inherited
cloned parameter lists. I don't think this case can come up today, but
it's better to be correct when we do hit it.

rdar://problem/30167924

2017-01-31 16:30:01 -08:00

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