[Actualizer] Fix: Generate missing FOs of functions actualized by FOs

^KT-68801
diff --git a/compiler/ir/ir.actualization/src/main/kotlin/org/jetbrains/kotlin/backend/common/actualizer/SpecialFakeOverrideSymbolsResolver.kt b/compiler/ir/ir.actualization/src/main/kotlin/org/jetbrains/kotlin/backend/common/actualizer/SpecialFakeOverrideSymbolsResolver.kt
index d02950e..33aa5c8 100644
--- a/compiler/ir/ir.actualization/src/main/kotlin/org/jetbrains/kotlin/backend/common/actualizer/SpecialFakeOverrideSymbolsResolver.kt
+++ b/compiler/ir/ir.actualization/src/main/kotlin/org/jetbrains/kotlin/backend/common/actualizer/SpecialFakeOverrideSymbolsResolver.kt
@@ -114,9 +114,7 @@
 
     private fun IrOverridableDeclaration<*>.collectOverrides(visited: MutableSet<IrSymbol>): Sequence<IrSymbol> = sequence {
         if (visited.add(symbol)) {
-            if (!isFakeOverride) {
-                yield(symbol)
-            }
+            yield(symbol)
             for (overridden in overriddenSymbols) {
                 yieldAll((overridden.remap().owner as IrOverridableDeclaration<*>).collectOverrides(visited))
             }
diff --git a/compiler/testData/codegen/box/multiplatform/k2/kt68801.kt b/compiler/testData/codegen/box/multiplatform/k2/kt68801.kt
index 5fb6d73..72e2793 100644
--- a/compiler/testData/codegen/box/multiplatform/k2/kt68801.kt
+++ b/compiler/testData/codegen/box/multiplatform/k2/kt68801.kt
@@ -1,8 +1,5 @@
 // ISSUE: KT-68801
 // LANGUAGE: +MultiPlatformProjects
-// IGNORE_BACKEND: JVM_IR JS_IR JS_IR_ES6 WASM NATIVE
-// ^^^ This test fails with `java.lang.IllegalArgumentException: There should be no references to expect classes at this point`
-//     at org.jetbrains.kotlin.backend.common.actualizer.SpecialFakeOverrideSymbolsResolver.processClass(SpecialFakeOverrideSymbolsResolver.kt:97)
 
 // MODULE: common
 // FILE: common.kt
diff --git a/compiler/testData/diagnostics/tests/multiplatform/hmpp/hmppModalityClash.fir.kt b/compiler/testData/diagnostics/tests/multiplatform/hmpp/hmppModalityClash.fir.kt
index e5996c6..705de86 100644
--- a/compiler/testData/diagnostics/tests/multiplatform/hmpp/hmppModalityClash.fir.kt
+++ b/compiler/testData/diagnostics/tests/multiplatform/hmpp/hmppModalityClash.fir.kt
@@ -1,8 +1,8 @@
 // MODULE: common
 // TARGET_PLATFORM: Common
-expect abstract class Foo() {
-    abstract fun foo()
-}
+<!EXPECT_ACTUAL_INCOMPATIBILITY{JVM}!>expect abstract class Foo() {
+    <!EXPECT_ACTUAL_INCOMPATIBILITY{JVM}!>abstract fun foo()<!>
+}<!>
 
 <!ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED{METADATA}!>class Impl<!> : Foo() {}