Previously, enum entries were treated by the data-flow subsystem similar
to other class/singletons. As a consequence, calls like
'Enum.ENTRY.property' had IdentifierInfo of 'property'.
However, specially for enum entries, descriptor of 'property' is one and
the same for all entries. It means that from the data-flow point of
view, 'Enum.ONE.property' and 'Enum.TWO.property' are *one and the same
data-flow values*.
It could obviously lead to some bogus smartcasts, so this commit
introduces separate IdentifierInfo.EnumEntry and uses it to build proper
qualified values.
^KT-20772 Fixed
Dmitry Savvinov