Prevent generation of delegations to interfaces private methods

#KT-13381 Fixed
 #KT-13996 Fixed

compiler/testData/codegen/bytecodeListing/noDelegationsToPrivateInterfaceMembers.kt

@@ -0,0 +1,10 @@
+interface A {
+    // There must be no delegation methods for 'log' and 'bar' in C as they are private
+    private val log: String get() = "O"
+    private fun bar() = "K"
+
+    fun foo() = log + bar()
+}
+
+interface B : A
+class C : B

compiler/testData/codegen/bytecodeListing/noDelegationsToPrivateInterfaceMembers.txt

@@ -0,0 +1,30 @@
+@kotlin.Metadata
+public final class A$DefaultImpls {
+    inner class A$DefaultImpls
+    private static method bar(p0: A): java.lang.String
+    public static @org.jetbrains.annotations.NotNull method foo(p0: A): java.lang.String
+    private static method getLog(p0: A): java.lang.String
+}
+
+@kotlin.Metadata
+public interface A {
+    inner class A$DefaultImpls
+    public abstract @org.jetbrains.annotations.NotNull method foo(): java.lang.String
+}
+
+@kotlin.Metadata
+public final class B$DefaultImpls {
+    inner class B$DefaultImpls
+    public static @org.jetbrains.annotations.NotNull method foo(p0: B): java.lang.String
+}
+
+@kotlin.Metadata
+public interface B {
+    inner class B$DefaultImpls
+}
+
+@kotlin.Metadata
+public final class C {
+    public method <init>(): void
+    public @org.jetbrains.annotations.NotNull method foo(): java.lang.String
+}