swift

3d11fb97 - [SR-13466]: Fix demangling of optionals containing function types.

[SR-13466]: Fix demangling of optionals containing function types. ImplFunctionType nodes inside optionals are wrapped in Type nodes, which means that isSimpleType() needs to look through the Type node when we're printing them, or we fail to wrap them with parentheses. <rdar://67915116>