Objects now have synthetic class objects in deserialization as well. "Class"
proto message now can have a synthetic class object proto within, if it's not
contained in any external class file, which is the case with objects. Drop
"class_object_present" field from binary format, since its value is equivalent
to the presence of "class_object" field
Drop "Callable primary_constructor" field, because it requires serializer to
serialize the fact that a class has a primary constructor. Default primary
constructors for objects etc. may not be serialized, because they can be
re-created trivially when they're loaded. There are three options: a class
doesn't have a primary constructor, a class has a default primary constructor,
a class has a custom primary constructor. This explains the change in
descriptors.proto
This helps to avoid a nasty hack with loading inner Kotlin classes in JDR,
which makes it a bit easier to 'lazify' JDR, since now the container of a
Kotlin class is no longer required to be resolved eagerly before resolution of
the class itself
A new special CallableKind for properties created for objects --
OBJECT_PROPERTY.
Also fix PropertyPsiData.isFinal() in case of properties backed by fields
Evgeny Gerashchenko