KT-7918 J2K: don't generate jvmOverloads on private declarations

#KT-7918 Fixed

j2k/src/org/jetbrains/kotlin/j2k/Converter.kt

@@ -427,7 +427,7 @@ class Converter private constructor(
 
         if (function == null) return null
 
-        if (function.parameterList.parameters.any { it.defaultValue != null }) {
+        if (function.parameterList.parameters.any { it.defaultValue != null } && !function.modifiers.isPrivate) {
             function.annotations += Annotations(
                     listOf(Annotation(Identifier("jvmOverloads").assignNoPrototype(),
                                       listOf(),

j2k/testData/fileOrElement/constructors/privateConstructors.kt

@@ -1,4 +1,4 @@
-class C jvmOverloads private constructor(arg1: Int, arg2: Int, arg3: Int = 0) {
+class C private constructor(arg1: Int, arg2: Int, arg3: Int = 0) {
 
     public constructor(arg1: Int) : this(arg1, 0, 0) {
     }

j2k/testData/fileOrElement/overloads/Private.java

@@ -0,0 +1,10 @@
+class A {
+    private int bar(String s) {
+        System.out.println("s = " + s);
+        return 0;
+    }
+
+    private int bar() {
+        return bar(null);
+    }
+}

j2k/testData/fileOrElement/overloads/Private.kt

@@ -0,0 +1,6 @@
+class A {
+    private fun bar(s: String? = null): Int {
+        println("s = " + s!!)
+        return 0
+    }
+}

j2k/tests/org/jetbrains/kotlin/j2k/JavaToKotlinConverterForWebDemoTestGenerated.java

@@ -3520,6 +3520,12 @@ public class JavaToKotlinConverterForWebDemoTestGenerated extends AbstractJavaTo
             doTest(fileName);
         }
 
+        @TestMetadata("Private.java")
+        public void testPrivate() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("j2k/testData/fileOrElement/overloads/Private.java");
+            doTest(fileName);
+        }
+
         @TestMetadata("Simple.java")
         public void testSimple() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("j2k/testData/fileOrElement/overloads/Simple.java");

j2k/tests/org/jetbrains/kotlin/j2k/JavaToKotlinConverterSingleFileTestGenerated.java

@@ -3520,6 +3520,12 @@ public class JavaToKotlinConverterSingleFileTestGenerated extends AbstractJavaTo
             doTest(fileName);
         }
 
+        @TestMetadata("Private.java")
+        public void testPrivate() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("j2k/testData/fileOrElement/overloads/Private.java");
+            doTest(fileName);
+        }
+
         @TestMetadata("Simple.java")
         public void testSimple() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("j2k/testData/fileOrElement/overloads/Simple.java");