Do not generate stubs if there is no special bridge in the current class
- there are already Kotlin super class in hierarchy
- special bridge has the same signature as method itself
#KT-11915 Fixed
- don't do anything for interfaces because there's no point in generating
abstract methods which are already abstract in supertypes
- don't use getDeclaredFunctionByRawSignature, check function signature
manually instead
- don't use isOrOverridesSynthesized because 'toArray' is never synthesized
Alexander Udalov