swift234

Don't allow one to utter DynamicSelf except as a class/protocol method's result type.

Previously, semantic analysis would permit uses of DynamicSelf in the
body of a DynamicSelf method. However, SILGen's lowering of
DynamicSelf to the underlying self type caused breakage. Because we
don't have a pressing need for this feature, just disable
it. Restricts the scope of <rdar://problem/15862605>.


Swift SVN r14172