swift234

AST: Make the @inout-ness of interface types for protocol members consistent with their old types.

There are two places that need to be fixed:

- getSelfTypeForContainer needs to check for a ProtocolDecl context instead of assuming ArchetypeType self == protocol method. Archetypes don't appear in interface types.
- semaFuncDecl's computeSelfType helper needs to have the same special case for protocol contexts as getSelfTypeForContainer.

This will hopefully be tested soon when I can land my next round of SIL interface type changes.

This exposes a problem with Chris's approach to handling the Self of @mutating protocol methods--the fact that they're still @inout manifests to the user if they try to use an uncurried instance method of a generic or existential type. This isn't on the critical path so leave it as <rdar://problem/15821762> for now.

Swift SVN r12312