K2 Scripting, Fir2Ir: allow out of order supertypes declaration

fix script declarations registration logic in Fir2Ir to allow
supertypes of a class to be defined later than the class itself.

#KT-64534 fixed

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

@@ -528,10 +528,12 @@ class Fir2IrConverter(
                 addDeclarationToParentIfNeeded(irScript)
                 declarationStorage.withScope(irScript.symbol) {
                     irScript.parent = parent
+                    for (scriptDeclaration in declaration.declarations.filterIsInstance<FirRegularClass>()) {
+                        registerClassAndNestedClasses(scriptDeclaration, irScript)
+                    }
                     for (scriptDeclaration in declaration.declarations) {
                         when (scriptDeclaration) {
                             is FirRegularClass -> {
-                                registerClassAndNestedClasses(scriptDeclaration, irScript)
                                 processClassAndNestedClassHeaders(scriptDeclaration)
                             }
                             is FirTypeAlias -> classifierStorage.createAndCacheIrTypeAlias(scriptDeclaration, irScript)

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirPsiBlackBoxCodegenTestGenerated.java

@@ -54575,6 +54575,12 @@ public class FirPsiBlackBoxCodegenTestGenerated extends AbstractFirPsiBlackBoxCo
       runTest("compiler/testData/codegen/box/script/localCaptureTestsK2.kt");
     }
 
+    @Test
+    @TestMetadata("outOuOrderDecls.kt")
+    public void testOutOuOrderDecls() {
+      runTest("compiler/testData/codegen/box/script/outOuOrderDecls.kt");
+    }
+
     @Test
     @TestMetadata("scripInstance.kt")
     public void testScripInstance() {