Don't generate unnecessary accessors for private class properties

compiler/testData/asJava/lightClasses/nullabilityAnnotations/PrivateInClass.java

@@ -1,9 +1,8 @@
 public final class PrivateInClass implements kotlin.jvm.internal.KObject {
-    private final java.lang.String nn = "";
-    private final java.lang.String n = "";
-
     private final java.lang.String getNn() { /* compiled code */ }
 
+    private final void setNn(@jet.runtime.typeinfo.JetValueParameter(name = "value") java.lang.String value) { /* compiled code */ }
+
     private final java.lang.String getN() { /* compiled code */ }
 
     private final java.lang.String bar(@jet.runtime.typeinfo.JetValueParameter(name = "a") java.lang.String a, @jet.runtime.typeinfo.JetValueParameter(name = "b", type = "?") java.lang.String b) { /* compiled code */ }

compiler/testData/asJava/lightClasses/nullabilityAnnotations/PrivateInClass.kt

@@ -1,7 +1,10 @@
 // PrivateInClass
 
 class PrivateInClass private (s: String?) {
-    private val nn: String = ""
-    private val n: String? = ""
+    private var nn: String
+        get() = ""
+        set(value) {}
+    private val n: String?
+        get() = ""
     private fun bar(a: String, b: String?): String? = null
 }

compiler/testData/asJava/lightClasses/nullabilityAnnotations/PrivateInTrait.java

@@ -2,6 +2,8 @@ public interface PrivateInTrait extends kotlin.jvm.internal.KObject {
     @org.jetbrains.annotations.NotNull
     java.lang.String getNn();
 
+    void setNn(@jet.runtime.typeinfo.JetValueParameter(name = "value") @org.jetbrains.annotations.NotNull java.lang.String value);
+
     @org.jetbrains.annotations.Nullable
     java.lang.String getN();
 

compiler/testData/asJava/lightClasses/nullabilityAnnotations/PrivateInTrait.kt

@@ -1,7 +1,10 @@
 // PrivateInTrait
 
 trait PrivateInTrait {
-    private val nn: String
+    private var nn: String
+        get() = ""
+        set(value) {}
     private val n: String?
+        get() = ""
     private fun bar(a: String, b: String?): String?
 }