[FIR2IR] Fix problem with double-generation of local class members

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

@@ -6,6 +6,7 @@
 package org.jetbrains.kotlin.fir.backend.generators
 
 import org.jetbrains.kotlin.descriptors.PropertyDescriptor
+import org.jetbrains.kotlin.descriptors.Visibilities
 import org.jetbrains.kotlin.fir.backend.*
 import org.jetbrains.kotlin.fir.declarations.*
 import org.jetbrains.kotlin.fir.declarations.impl.FirDefaultPropertyGetter
@@ -73,9 +74,20 @@ internal class ClassMemberGenerator(
                 processedCallableNames += DataClassMembersGenerator(components).generateDataClassMembers(klass, irClass)
             }
             with(fakeOverrideGenerator) { irClass.addFakeOverrides(klass, processedCallableNames) }
-            klass.declarations.forEach {
+            klass.declarations.forEach { declaration ->
-                if (it !is FirTypeAlias && (it !is FirConstructor || !it.isPrimary)) {
+                when {
-                    it.accept(visitor, null)
+                    declaration is FirTypeAlias -> {
+                    }
+                    declaration is FirConstructor && declaration.isPrimary -> {
+                    }
+                    declaration is FirRegularClass && declaration.visibility == Visibilities.LOCAL -> {
+                        val irNestedClass = classifierStorage.getCachedIrClass(declaration)!!
+                        irNestedClass.parent = irClass
+                        conversionScope.withParent(irNestedClass) {
+                            convertClassContent(irNestedClass, declaration)
+                        }
+                    }
+                    else -> declaration.accept(visitor, null)
                 }
             }
             annotationGenerator.generate(irClass, klass)

compiler/testData/codegen/box/classes/kt2607.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 fun box() : String {
     val o = object {
 

compiler/testData/codegen/box/closures/captureInSuperConstructorCall/constructorParameterAndLocalCapturedInLambdaInLocalClass.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 open class Base(val fn: () -> String)
 
 fun box(): String {

compiler/testData/codegen/box/closures/captureInSuperConstructorCall/constructorParameterCapturedInLambdaInLocalClass.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 open class Base(val fn: () -> String)
 
 fun box(): String {

compiler/testData/codegen/box/closures/captureInSuperConstructorCall/constructorParameterCapturedInLambdaInLocalClass2.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 open class Base(val fn: () -> String)
 
 fun box(): String {

compiler/testData/codegen/box/closures/captureInSuperConstructorCall/localCapturedInLambdaInInnerClassInLocalClass.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 open class Base(val fn: () -> String)
 
 fun box(): String {

compiler/testData/codegen/box/defaultArguments/constructor/kt2852.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 fun box(): String {
     val o = object {
         inner class A(val value: String = "OK")

compiler/testData/codegen/box/innerNested/superConstructorCall/objectExtendsInnerOfLocalWithCapture.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 fun box(): String {
     class Local {
         open inner class Inner(val s: String) {

compiler/testData/codegen/box/localClasses/closureOfInnerLocalClass.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // Enable for JVM backend when KT-8120 gets fixed
 // IGNORE_BACKEND: JVM
 

compiler/testData/codegen/box/localClasses/closureWithSelfInstantiation.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // Enable for JVM backend when KT-8120 gets fixed
 // IGNORE_BACKEND: JVM
 

compiler/testData/codegen/box/localClasses/innerClassInLocalClass.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 class A {
     val a = 1
     fun calc () : Int {

compiler/testData/codegen/box/localClasses/innerOfLocalCaptureExtensionReceiver.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 fun String.bar(): String {
     open class Local {
         fun result() = this@bar

compiler/testData/codegen/box/localClasses/ownClosureOfInnerLocalClass.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 fun box(): String {
     var log = ""