Fix modifiers generation for companion objects

when language verion is 1.3

 #KT-23002: Fixed

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

@@ -897,7 +897,15 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
                 deprecatedFieldForInvisibleCompanionObject &&
                 !properVisibilityForCompanionObjectInstanceField &&
                 (properFieldVisibilityFlag & (ACC_PRIVATE | ACC_PROTECTED)) != 0;
-        int fieldAccessFlags = ACC_PUBLIC | ACC_STATIC | ACC_FINAL;
+        boolean doNotGeneratePublic =
+                properVisibilityForCompanionObjectInstanceField && (properFieldVisibilityFlag & (ACC_PRIVATE | ACC_PROTECTED)) != 0;
+        int fieldAccessFlags;
+        if (doNotGeneratePublic) {
+            fieldAccessFlags = ACC_STATIC | ACC_FINAL;
+        }
+        else {
+            fieldAccessFlags = ACC_PUBLIC | ACC_STATIC | ACC_FINAL;
+        }
         if (properVisibilityForCompanionObjectInstanceField) {
             fieldAccessFlags |= properFieldVisibilityFlag;
         }

compiler/testData/codegen/box/compatibility/privateCompanionObject.kt

@@ -0,0 +1,12 @@
+// LANGUAGE_VERSION: 1.3
+
+class Test {
+    private companion object {
+        val res = "OK"
+    }
+    fun res() = res
+}
+
+fun box(): String {
+    return Test().res()
+}

compiler/testData/codegen/bytecodeListing/invisibleCompanionObject.txt

@@ -22,7 +22,7 @@ final class TestPrivateCompanion$Test {
 
 @kotlin.Metadata
 public final class TestPrivateCompanion {
-    public private final static field Test: TestPrivateCompanion$Test
+    private final static field Test: TestPrivateCompanion$Test
     inner class TestPrivateCompanion$Test
     static method <clinit>(): void
     public method <init>(): void
@@ -37,7 +37,7 @@ public final class TestProtectedCompanion$Test {
 
 @kotlin.Metadata
 public class TestProtectedCompanion {
-    public protected final static field Test: TestProtectedCompanion$Test
+    protected final static field Test: TestProtectedCompanion$Test
     inner class TestProtectedCompanion$Test
     static method <clinit>(): void
     public method <init>(): void

compiler/tests-ir-jvm/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java

@@ -4454,6 +4454,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/compatibility/dataClassEqualsHashCodeToString.kt");
             doTest(fileName);
         }
+
+        @TestMetadata("privateCompanionObject.kt")
+        public void testPrivateCompanionObject() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/compatibility/privateCompanionObject.kt");
+            doTest(fileName);
+        }
     }
 
     @TestMetadata("compiler/testData/codegen/box/constants")

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

@@ -4454,6 +4454,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/compatibility/dataClassEqualsHashCodeToString.kt");
             doTest(fileName);
         }
+
+        @TestMetadata("privateCompanionObject.kt")
+        public void testPrivateCompanionObject() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/compatibility/privateCompanionObject.kt");
+            doTest(fileName);
+        }
     }
 
     @TestMetadata("compiler/testData/codegen/box/constants")

compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java

@@ -4454,6 +4454,12 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/compatibility/dataClassEqualsHashCodeToString.kt");
             doTest(fileName);
         }
+
+        @TestMetadata("privateCompanionObject.kt")
+        public void testPrivateCompanionObject() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/compatibility/privateCompanionObject.kt");
+            doTest(fileName);
+        }
     }
 
     @TestMetadata("compiler/testData/codegen/box/constants")

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

@@ -5054,6 +5054,12 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/compatibility/dataClassEqualsHashCodeToString.kt");
             doTest(fileName);
         }
+
+        @TestMetadata("privateCompanionObject.kt")
+        public void testPrivateCompanionObject() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/compatibility/privateCompanionObject.kt");
+            doTest(fileName);
+        }
     }
 
     @TestMetadata("compiler/testData/codegen/box/constants")