[K/N][optmz] Fix for https://youtrack.jetbrains.com/issue/KT-49234

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/FileInitializersOptimization.kt

@@ -439,10 +439,8 @@ internal object FileInitializersOptimization {
                     } else {
                         require(objectClass.isExternal || objectClass is IrLazyClass) { "No constructor for ${objectClass.render()}" }
                     }
-                    val file = objectClass.fileOrNull ?: return data
-                    val fileId = initializedFiles.fileIds[file]!!
-                    if (data.get(fileId)) return data
-                    return data.copy().also { it.set(fileId) }
+                    // Don't update [data] as the constructor might not be called here (the object might be initialized already).
+                    return data
                 }
 
                 private fun processCall(expression: IrFunctionAccessExpression, actualCallee: IrFunction, data: BitSet): BitSet {

kotlin-native/backend.native/tests/build.gradle

@@ -1622,6 +1622,11 @@ standaloneTest("initializers_return2") {
     useGoldenData = true
 }
 
+standaloneTest("initializers_object") {
+    source = "codegen/initializers/object.kt"
+    flags = ['-Xir-property-lazy-initialization=enable']
+}
+
 linkTest("initializers_linkTest1") {
     useGoldenData = true
     source = "codegen/initializers/linkTest1_main.kt"

kotlin-native/backend.native/tests/codegen/initializers/object.kt

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+// FILE: lib.kt
+var z = false
+
+// FILE: lib2.kt
+val x = foo()
+
+fun foo(): Int {
+    z = true
+    return 42
+}
+
+object Z {
+    fun bar() { }
+    fun baz() = x
+}
+
+// FILE: main.kt
+import kotlin.test.*
+
+fun main() {
+    Z.bar()
+    assertFalse(z)
+    assertEquals(42, Z.baz())
+    assertTrue(z)
+}