Generation of inline classes is quite complicated: we mangle methods,
add stubs and synthesized methods. So, for simplicity, to avoid
logic duplication in dummy resolve and in the backend, currently we
will use only the latter for light classes generation
#KT-26843 Fixed
Before this commit, sealed sub-class without state was considered
a style issue.
After this commit, sealed sub-class without state AND custom equals
is considered a probable bug,
because comparison of its instances is very fragile.
Alternative fix (generate equals & hashCode by identity) is added.
Mikhail Glukhikh