Implement lateinit in backend

compiler/testData/codegen/boxWithStdlib/fullJdk/lateinitVisibility.kt

@@ -0,0 +1,24 @@
+import java.lang.reflect.Modifier
+
+public class A {
+    private lateinit val privateField: String
+    protected lateinit var protectedField: String
+    public lateinit var publicField: String
+
+    fun test(): String {
+        val clazz = A::class.java
+        val cond = arrayListOf<String>()
+
+        if (!Modifier.isPrivate(clazz.getDeclaredField("privateField").modifiers)) cond += "NOT_PRIVATE"
+        if (!Modifier.isProtected(clazz.getDeclaredField("protectedField").modifiers)) cond += "NOT_PROTECTED"
+        if (!Modifier.isPublic(clazz.getDeclaredField("publicField").modifiers)) cond += "NOT_PUBLIC"
+
+        if (Modifier.isPrivate(clazz.getDeclaredField("privateField").modifiers)) cond += "FINAL"
+
+        return if (cond.isEmpty()) "OK" else cond.joinToString()
+    }
+}
+
+fun box(): String {
+    return A().test()
+}