[01-02-2019] Opaque result types #22042
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To represent the abstracted interface of an opaque type, we need a generic signature that refines the outer context generic signature with an additional generic parameter representing the underlying type and its exposed constraints. Opaque types also need to be keyed by their originating decl, so that we can treat values of the same opaque type as the same. When we check a FuncDecl with an opaque type specified as its return type, create an OpaqueTypeDecl and associate it with the originating decl. (A representation for *types* derived from the opaque decl will come next.)
It's currently meaningless, and it'll require thought to pass the correct value when it becomes meaningful.
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Cherry-pick of #21137 to the swift-master-convergence-01-02-2019 branch.
rdar://problem/46140804