Fix initialization order

* put inheritance code in the beginning
 * put top-level initializer after any declaration

js/js.ast/src/org/jetbrains/kotlin/js/backend/ast/JsClassModel.kt

@@ -18,5 +18,6 @@ package org.jetbrains.kotlin.js.backend.ast
 
 class JsClassModel(val name: JsName, val superName: JsName?) {
     val interfaces: MutableSet<JsName> = mutableSetOf()
+    val preDeclarationBlock = JsGlobalBlock()
     val postDeclarationBlock = JsGlobalBlock()
 }

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/BoxJsTestGenerated.java

@@ -3616,6 +3616,11 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
             runTest("js/js.translator/testData/box/inheritance/overrideAnyMethods.kt");
         }
 
+        @TestMetadata("prototypeOrder.kt")
+        public void testPrototypeOrder() throws Exception {
+            runTest("js/js.translator/testData/box/inheritance/prototypeOrder.kt");
+        }
+
         @TestMetadata("valOverride.kt")
         public void testValOverride() throws Exception {
             runTest("js/js.translator/testData/box/inheritance/valOverride.kt");

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/IrBoxJsTestGenerated.java

@@ -3616,6 +3616,11 @@ public class IrBoxJsTestGenerated extends AbstractIrBoxJsTest {
             runTest("js/js.translator/testData/box/inheritance/overrideAnyMethods.kt");
         }
 
+        @TestMetadata("prototypeOrder.kt")
+        public void testPrototypeOrder() throws Exception {
+            runTest("js/js.translator/testData/box/inheritance/prototypeOrder.kt");
+        }
+
         @TestMetadata("valOverride.kt")
         public void testValOverride() throws Exception {
             runTest("js/js.translator/testData/box/inheritance/valOverride.kt");

js/js.translator/testData/box/inheritance/prototypeOrder.kt

@@ -0,0 +1,14 @@
+// EXPECTED_REACHABLE_NODES: 1117
+package foo
+
+class C: B()
+open class B: A()
+open class A
+
+fun box(): String {
+    val c = C()
+
+    if (c !is A) return "FAIL"
+
+    return "OK"
+}