[JS IR & WASM] Fix executing init blocks for enums with nested objects

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/JsLoweringPhases.kt

@@ -755,7 +755,8 @@ private val staticMembersLoweringPhase = makeDeclarationTransformerPhase(
 private val objectDeclarationLoweringPhase = makeDeclarationTransformerPhase(
     ::ObjectDeclarationLowering,
     name = "ObjectDeclarationLowering",
-    description = "Create lazy object instance generator functions"
+    description = "Create lazy object instance generator functions",
+    prerequisite = setOf(enumClassCreateInitializerLoweringPhase)
 )
 
 private val invokeStaticInitializersPhase = makeBodyLoweringPhase(

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/ObjectLowering.kt

@@ -26,6 +26,7 @@ import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid
 import org.jetbrains.kotlin.ir.visitors.transformChildrenVoid
 import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.utils.addToStdlib.safeAs
 
 class ObjectDeclarationLowering(
     val context: JsCommonBackendContext
@@ -34,6 +35,11 @@ class ObjectDeclarationLowering(
     private var IrClass.instanceField by context.mapping.objectToInstanceField
     private var IrClass.syntheticPrimaryConstructor by context.mapping.classToSyntheticPrimaryConstructor
 
+    /**
+     * If the object being lowered is nested inside an enum class, we want to also initialize the enum entries when initializing the object.
+     */
+    private var IrClass.initEntryInstancesFun: IrSimpleFunction? by context.mapping.enumClassToInitEntryInstancesFun
+
     override fun transformFlat(declaration: IrDeclaration): List<IrDeclaration>? {
         if (declaration !is IrClass || declaration.kind != ClassKind.OBJECT || declaration.isEffectivelyExternal())
             return null
@@ -54,8 +60,12 @@ class ObjectDeclarationLowering(
 
         val primaryConstructor = declaration.primaryConstructor ?: declaration.syntheticPrimaryConstructor!!
 
+        val initEntryInstancesFun = declaration.parent.safeAs<IrClass>()?.initEntryInstancesFun
+
         getInstanceFun.body = context.irFactory.createBlockBody(UNDEFINED_OFFSET, UNDEFINED_OFFSET) {
             statements += context.createIrBuilder(getInstanceFun.symbol).irBlockBody(getInstanceFun) {
+                if (initEntryInstancesFun != null)
+                    +irCall(initEntryInstancesFun)
                 +irIfThen(
                     irEqualsNull(irGetField(null, instanceField)),
                     // Instance field initialized inside constructor

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/WasmLoweringPhases.kt

@@ -421,7 +421,8 @@ private val builtInsLoweringPhase = makeWasmModulePhase(
 private val objectDeclarationLoweringPhase = makeWasmModulePhase(
     ::ObjectDeclarationLowering,
     name = "ObjectDeclarationLowering",
-    description = "Create lazy object instance generator functions"
+    description = "Create lazy object instance generator functions",
+    prerequisite = setOf(enumClassCreateInitializerLoweringPhase)
 )
 
 private val objectUsageLoweringPhase = makeWasmModulePhase(