Slava Pestov e1cea881ba AST: Rip out "defaulted definitions" from NormalConformance, NFC ...

It appears we were only using this to see if an associated type was
derived or defaulted. This code didn't mesh well with the other stuff
I was doing for default implementations, so I'd rather rip it out and
just rely on calling 'isImplicit' to check for derived associated
types instead.

Note that there's a small change of behavior -- if an associated type
is derived for one conformance, and then used as a witness in another,
we were previously only marking it as defaulted in the first one,
but now it is marked as defaulted in both. I do not believe this has
any meaningful consequences.

2016-03-17 03:57:23 -07:00

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