We have two sources of truth in Fir2Ir - declaration storages,
which maps fir to ir symbols and symbolTable which maps
IdSignature to ir symbol.
The long-term goal is to have only one - declaration storages. This
commit goes to this goal by removing all symbolTable usages that are
straightforward to remove, i.e., all except:
1. classes as there is some code, that uses signature inside ClassSymbol
2. functions/properties as sometimes declaration storage fails to match
symbols correctly (i.e. for generated data class members)
3. type parameters, as we need to remove functions first.
As a side effect, it fixes some of the signature clash cases on valid
code, as we no longer rely on signature uniqueness, except cases
mentioned above.
^KT-65274 Fixed
^KT-64990
Pavel Kunyavskiy