- Allow declaring protected constructors in sealed classes
- Make default visibility of sealed class constructor `protected`

KT-44861
KT-44865

Usually FIR enum entry is initialized by anonymous object,
which is the container for all enum entry' declarations.
However, for simple enum entries there is no need of initializer at all.

This breaks total kotlin resolve test because of incorrect rendering
of ConeClassErrorType (we are trying to read its symbol)

Testing: total kotlin test controls no stubs in FIR in non-stub-mode
#KT-29002 Fixed

So #KT-24021 Fixed

So #KT-24088 In Progress

Support: calls, constructor calls, annotation calls, arguments
Support: enums, primary constructors, const modifier
Support: inner modifier, qualified types
Add: some base transformed types
Fix: acceptChildren etc.
Progress: #KT-24013