Don't generate private members in interface

compiler/testData/codegen/box/traits/traitWithPrivateMember.kt

@@ -0,0 +1,26 @@
+interface Z {
+
+    fun testFun() : String {
+        return privateFun()
+    }
+
+    fun testProperty() : String {
+        return privateProp
+    }
+
+    private fun privateFun(): String {
+        return "O"
+    }
+
+    private val privateProp: String
+        get() = "K"
+}
+
+object Z2 : Z {
+
+}
+
+fun box() : String {
+    return Z2.testFun() + Z2.testProperty()
+}
+

compiler/testData/codegen/box/traits/traitWithPrivateMemberAccessFromLambda.kt

@@ -0,0 +1,26 @@
+interface Z {
+
+    fun testFun(): String {
+        return { privateFun() } ()
+    }
+
+    fun testProperty(): String {
+        return { privateProp } ()
+    }
+
+    private fun privateFun(): String {
+        return "O"
+    }
+
+    private val privateProp: String
+        get() = "K"
+}
+
+object Z2 : Z {
+
+}
+
+fun box(): String {
+    return Z2.testFun() + Z2.testProperty()
+}
+