Fix light class exception on empty multifile facade

Fix generating multifile facade with all members private (in bytecode)
leading to delegate not being generated for corresponding light class

 #KT-20966 Fixed

compiler/testData/asJava/lightClasses/compilationErrors/AllInlineOnly.java

@@ -0,0 +1,2 @@
+public final class AllInlineOnly {
+}

compiler/testData/asJava/lightClasses/compilationErrors/AllInlineOnly.kt

@@ -0,0 +1,11 @@
+// p.AllInlineOnly
+@file:kotlin.jvm.JvmMultifileClass
+@file:kotlin.jvm.JvmName("AllInlineOnly")
+
+package p
+
+@kotlin.internal.InlineOnly
+public inline fun f(): Int = 3
+
+@kotlin.internal.InlineOnly
+public inline fun g(p: String): String = "p"

compiler/testData/asJava/lightClasses/facades/AllPrivate.java

@@ -0,0 +1,2 @@
+public final class AllPrivate {
+}

compiler/testData/asJava/lightClasses/facades/AllPrivate.kt

@@ -0,0 +1,9 @@
+// p.AllPrivate
+@file:kotlin.jvm.JvmMultifileClass
+@file:kotlin.jvm.JvmName("AllPrivate")
+
+package p
+
+private fun f(): Int = 3
+
+private fun g(p: String): String = "p"