Initialize class companion object fields on accessing its java class

compiler/backend/src/org/jetbrains/kotlin/codegen/ImplementationBodyCodegen.java

@@ -1001,6 +1001,12 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
             InstructionAdapter v = createOrGetClInitCodegen().v;
             v.anew(classAsmType);
             v.invokespecial(classAsmType.getInternalName(), "<init>", "()V", false);
+            if (isCompanionObjectWithBackingFieldsInOuter(descriptor)) {
+                //We should load containing class to initialize companion fields
+                StackValue companion = StackValue.singletonForCompanion(descriptor, typeMapper);
+                companion.put(companion.type, v);
+                AsmUtil.pop(v, companion.type);
+            }
             return;
         }
 

compiler/testData/codegen/box/objects/initializationOrder.kt

@@ -0,0 +1,16 @@
+var result = "OK"
+
+class A {
+    companion object {
+        var z = result
+
+        fun patchResult() {
+            result = "fail"
+        }
+    }
+}
+
+fun box(): String {
+    A.patchResult()
+    return A.z
+}

compiler/tests/org/jetbrains/kotlin/codegen/generated/BlackBoxCodegenTestGenerated.java

@@ -5560,6 +5560,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             doTest(fileName);
         }
 
+        @TestMetadata("initializationOrder.kt")
+        public void testInitializationOrder() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/box/objects/initializationOrder.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("kt1047.kt")
         public void testKt1047() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/box/objects/kt1047.kt");