swift

bd7db677 - MandatoryPerformanceOptimizations: perform function signature optimization to remove metatype arguments

MandatoryPerformanceOptimizations: perform function signature optimization to remove metatype arguments Generic specialization already takes care of removing metatype arguments of generic functions. But sometimes non-generic functions have metatype arguments which must be removed. We need handle this case with a function signature optimization. This enables, for example, to use `OptionSet` in embedded swift. rdar://121206953