[Psi2Ir] Fix Lazy Fake override field

- add comment about problem with DeserializedPropertyDescriptor

compiler/frontend/src/org/jetbrains/kotlin/resolve/resolveUtil.kt

@@ -13,6 +13,7 @@ fun PropertyDescriptor.hasBackingField(bindingContext: BindingContext?): Boolean
     kind == CallableMemberDescriptor.Kind.FAKE_OVERRIDE -> overriddenDescriptors.any { it.hasBackingField(bindingContext) }
     source is KotlinSourceElement && bindingContext != null -> bindingContext.get(BindingContext.BACKING_FIELD_REQUIRED, this) ?: false
     compileTimeInitializer != null -> true
+//    backingField != null -> true // TODO: in case of DeserializedPropetyDescriptor this function returns incorrect result for FO field
     getter != null -> false
     else -> true
 }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/lazy/IrLazyField.kt

@@ -65,7 +65,11 @@ class IrLazyField(
 
     override val descriptor: PropertyDescriptor = symbol.descriptor
 
-    override val overriddenSymbols: MutableList<IrFieldSymbol> = mutableListOf()
+    override val overriddenSymbols: MutableList<IrFieldSymbol> by lazy {
+        symbol.descriptor.overriddenDescriptors.map {
+            stubGenerator.generateFieldStub(it.original).symbol
+        }.toMutableList()
+    }
 
     override var type: IrType by lazyVar {
         descriptor.type.toIrType()