swift234

Sema: Coercion from (A)->B to [objc_block] (A)->B.
Provide a BridgeToBlockExpr AST node as a temporary representation of func-to-block conversions. In Sema, when we see an [objc_block] type, insert a BridgeToBlock node and coerce the subexpression to the non-block func type.

Swift SVN r3897