swift234

Don't consider DynamicTypeExpr or MetatypeConversionExpr to produce a statically derived metatype.

Though the value may be statically known in some cases, that isn't good enough to do what we try to do with this information. In particular, if we invoke a class method on a MetatypeConversion, we want to dispatch to the method of the original metatype, not statically call the method of the converted type, which is what is evident in the AST. Fixes rdar://problem/18877135.

Swift SVN r23277