Doug Gregor 49b833b51a [Type checker] Eliminate the 'literalConformanceProto' state on type variables. ...

The 'literalConformanceProto' field of
TypeVariableType::Implementation didn't take into account equivalence
classes of type variables. Eliminate it, and either look at the actual
expressions (for optimizing constraints during constraint generation)
or the actual constraints on a given type variable (for determining
whether to include optionals in the set of potential type variable
bindings).

(cherry picked from commit 6bdd9cfae5)

2016-10-13 16:22:01 -07:00

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