Add serialization for PRIVATE_TO_THIS

compiler/testData/loadJava/compiledKotlin/visibility/PrivateToThis.kt

@@ -0,0 +1,15 @@
+package test
+
+class A<in I> {
+    private val foo: I = null!!
+    private var bar: I = null!!
+
+    private val val_with_accessors: I
+        get() = null!!
+
+    private var var_with_accessors: I
+        get() = null!!
+        set(value: I) {}
+
+    private fun bas(): I = null!!
+}

compiler/testData/loadJava/compiledKotlin/visibility/PrivateToThis.txt

@@ -0,0 +1,16 @@
+package test
+
+internal final class A</*0*/ in I> {
+    /*primary*/ public constructor A</*0*/ in I>()
+    private/*private to this*/ final var bar: I
+        private/*private to this*/ final fun <get-bar>(): I
+        private/*private to this*/ final fun <set-bar>(/*0*/ <set-?>: I): kotlin.Unit
+    private/*private to this*/ final val foo: I
+        private/*private to this*/ final fun <get-foo>(): I
+    private/*private to this*/ final val val_with_accessors: I
+        private/*private to this*/ final fun <get-val_with_accessors>(): I
+    private/*private to this*/ final var var_with_accessors: I
+        private/*private to this*/ final fun <get-var_with_accessors>(): I
+        private/*private to this*/ final fun <set-var_with_accessors>(/*0*/ value: I): kotlin.Unit
+    private/*private to this*/ final fun bas(): I
+}