[FE 1.0] Implement deprecation PRIVATE_CLASS_MEMBER_FROM_INLINE_WARNING warning

^KT-55179
^KT-56171 Fixed

core/descriptors/src/org/jetbrains/kotlin/resolve/DescriptorUtils.kt

@@ -135,6 +135,13 @@ val DeclarationDescriptor.isInsidePrivateClass: Boolean
         return parent != null && DescriptorVisibilities.isPrivate(parent.visibility)
     }
 
+val DeclarationDescriptor.isMemberOfCompanionOfPrivateClass: Boolean
+    get() {
+        val parent = containingDeclaration as? ClassDescriptor ?: return false
+        if (!parent.isCompanionObject) return false
+        return parent.isInsidePrivateClass
+    }
+
 val DeclarationDescriptor.isInsideInterface: Boolean
     get() {
         val parent = containingDeclaration as? ClassDescriptor