[K/N] Implement objc overridablity condition for IR

^KT-61511

compiler/fir/fir2ir/jvm-backend/src/org/jetbrains/kotlin/fir/backend/jvm/JvmFir2IrExtensions.kt

@@ -20,6 +20,7 @@ import org.jetbrains.kotlin.ir.IrBuiltIns
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
 import org.jetbrains.kotlin.ir.declarations.impl.IrFactoryImpl
+import org.jetbrains.kotlin.ir.overrides.IrExternalOverridabilityCondition
 import org.jetbrains.kotlin.ir.symbols.impl.DescriptorlessExternalPackageFragmentSymbol
 import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.load.java.JvmAnnotationNames
@@ -32,6 +33,7 @@ class JvmFir2IrExtensions(
     private val irDeserializer: JvmIrDeserializer,
     private val mangler: KotlinMangler.IrMangler,
 ) : Fir2IrExtensions, JvmGeneratorExtensions {
+    override val externalOverridabilityConditions: List<IrExternalOverridabilityCondition> = emptyList() // TODO: KT-61370, KT-61804
     override val classNameOverride: MutableMap<IrClass, JvmClassName> = mutableMapOf()
     override val cachedFields = CachedFieldsForObjectInstances(IrFactoryImpl, configuration.languageVersionSettings)
 

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrConverter.kt

@@ -561,7 +561,7 @@ class Fir2IrConverter(
                     IrFakeOverrideBuilder(
                         typeContextProvider(irBuiltins),
                         Fir2IrFakeOverrideStrategy(friendModulesMap(session), commonMemberStorage.symbolTable, irMangler),
-                        externalOverridabilityConditions = emptyList(), // TODO: KT-61370, KT-61804.
+                        fir2IrExtensions.externalOverridabilityConditions
                     )
                 },
                 moduleDescriptor, commonMemberStorage, irMangler, specialSymbolProvider, initializedIrBuiltIns

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrExtensions.kt

@@ -8,10 +8,12 @@ package org.jetbrains.kotlin.fir.backend
 import org.jetbrains.kotlin.fir.references.FirReference
 import org.jetbrains.kotlin.ir.declarations.IrClass
 import org.jetbrains.kotlin.ir.declarations.IrMemberWithContainerSource
+import org.jetbrains.kotlin.ir.overrides.IrExternalOverridabilityCondition
 import org.jetbrains.kotlin.ir.util.SymbolTable
 
 interface Fir2IrExtensions {
     val irNeedsDeserialization: Boolean
+    val externalOverridabilityConditions: List<IrExternalOverridabilityCondition>
 
     fun generateOrGetFacadeClass(declaration: IrMemberWithContainerSource, components: Fir2IrComponents): IrClass?
     fun deserializeToplevelClass(irClass: IrClass, components: Fir2IrComponents): Boolean
@@ -22,6 +24,7 @@ interface Fir2IrExtensions {
         override val irNeedsDeserialization: Boolean
             get() = false
 
+        override val externalOverridabilityConditions: List<IrExternalOverridabilityCondition> = emptyList()
         override fun generateOrGetFacadeClass(declaration: IrMemberWithContainerSource, components: Fir2IrComponents): IrClass? = null
         override fun deserializeToplevelClass(irClass: IrClass, components: Fir2IrComponents): Boolean = false
         override fun registerDeclarations(symbolTable: SymbolTable) {}

compiler/fir/native/src/org/jetbrains/kotlin/fir/backend/native/FirNativeOverrideChecker.kt

@@ -14,6 +14,12 @@ import org.jetbrains.kotlin.fir.declarations.FirSimpleFunction
 import org.jetbrains.kotlin.fir.scopes.FirOverrideChecker
 import org.jetbrains.kotlin.fir.scopes.impl.FirStandardOverrideChecker
 
+/**
+ * The same code, as in this class also exists in [org.jetbrains.kotlin.ir.objcinterop.ObjCOverridabilityCondition]
+ * and in [org.jetbrains.kotlin.ir.objcinterop.IrObjCOverridabilityCondition].
+ *
+ * When modifying, all three copies should be synchronized.
+ */
 class FirNativeOverrideChecker(private val session: FirSession) : FirOverrideChecker {
     private val standardOverrideChecker = FirStandardOverrideChecker(session)