[FIR2IR] Extract logic of IR declarations generation into separate component. Part 10

Restore old behavior of forced creation of fake-overrides
This behavior semantically is not fully correct, because it ignores existed
  f/o in storages and overwrites them, but replacing `createIr...` with
  `getOrCreate...` leads to problems with f/o in actual classes

^KT-61513

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrDeclarationStorage.kt

@@ -52,6 +52,7 @@ import org.jetbrains.kotlin.serialization.deserialization.descriptors.Deserializ
 import org.jetbrains.kotlin.utils.threadLocal
 import java.util.concurrent.ConcurrentHashMap
 
+@OptIn(LeakedDeclarationCaches::class)
 class Fir2IrDeclarationStorage(
     private val components: Fir2IrComponents,
     private val moduleDescriptor: FirModuleDescriptor,
@@ -440,7 +441,8 @@ class Fir2IrDeclarationStorage(
         return createAndCacheIrFunction(function, irParent, predefinedOrigin, isLocal, fakeOverrideOwnerLookupTag)
     }
 
-    private fun createAndCacheIrFunction(
+    @LeakedDeclarationCaches
+    fun createAndCacheIrFunction(
         function: FirFunction,
         irParent: IrDeclarationParent?,
         predefinedOrigin: IrDeclarationOrigin? = null,
@@ -543,7 +545,8 @@ class Fir2IrDeclarationStorage(
         }
     }
 
-    private fun createAndCacheIrProperty(
+    @LeakedDeclarationCaches
+    fun createAndCacheIrProperty(
         property: FirProperty,
         irParent: IrDeclarationParent?,
         predefinedOrigin: IrDeclarationOrigin? = null,

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/generators/FakeOverrideGenerator.kt

@@ -119,10 +119,11 @@ class FakeOverrideGenerator(
     ) {
         val isLocal = firClass !is FirRegularClass || firClass.isLocal
         useSiteOrStaticScope.processFunctionsByName(name) { functionSymbol ->
+            @OptIn(LeakedDeclarationCaches::class)
             createFakeOverriddenIfNeeded(
                 firClass, irClass, isLocal, functionSymbol,
                 declarationStorage::getCachedIrFunction,
-                declarationStorage::getOrCreateIrFunction,
+                declarationStorage::createAndCacheIrFunction,
                 createFakeOverrideSymbol = { firFunction, callableSymbol ->
                     val symbol = FirFakeOverrideGenerator.createSymbolForSubstitutionOverride(callableSymbol, firClass.symbol.classId)
                     FirFakeOverrideGenerator.createSubstitutionOverrideFunction(
@@ -147,10 +148,11 @@ class FakeOverrideGenerator(
         useSiteOrStaticScope.processPropertiesByName(name) { propertyOrFieldSymbol ->
             when (propertyOrFieldSymbol) {
                 is FirPropertySymbol -> {
+                    @OptIn(LeakedDeclarationCaches::class)
                     createFakeOverriddenIfNeeded(
                         firClass, irClass, isLocal, propertyOrFieldSymbol,
                         declarationStorage::getCachedIrProperty,
-                        declarationStorage::getOrCreateIrProperty,
+                        declarationStorage::createAndCacheIrProperty,
                         createFakeOverrideSymbol = { firProperty, callableSymbol ->
                             val symbolForOverride =
                                 FirFakeOverrideGenerator.createSymbolForSubstitutionOverride(callableSymbol, firClass.symbol.classId)