Fir2Ir introduces temporary symbols to avoid creating
fake overrides themselves. Further pipeline is not ready to
these symbols. That's why we have introduced separate pass,
that replaces all this symbols with real fake override
symbols, after they are created.
^KT-63645
There are a lot of restrictions between different parts of the pipeline.
1. Fake overrides can't be built before classes are actualized
2. Constants can't be evaluated before callables are actualized
3. Callables can't be actulaized before fake overrides are built
4. Checkers can't run before constants are evaluated
This commit reorders things to make all these restrictions happy.
^KT-63644
Pavel Kunyavskiy