Use DescriptorVisibilities.isPrivate instead of simple equality

compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/TypeTranslatorImpl.kt

@@ -44,7 +44,7 @@ class TypeTranslatorImpl(
         CommonSupertypes.commonSupertype(types)
 
     override fun isTypeAliasAccessibleHere(typeAliasDescriptor: TypeAliasDescriptor): Boolean {
-        if (typeAliasDescriptor.visibility != DescriptorVisibilities.PRIVATE) return true
+        if (!DescriptorVisibilities.isPrivate(typeAliasDescriptor.visibility)) return true
 
         val psiFile = typeAliasDescriptor.source.getPsi()?.containingFile ?: return false
 

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/TypeTranslator.kt

@@ -168,9 +168,7 @@ abstract class TypeTranslator(
 
     private fun SimpleType.toIrTypeAbbreviation(): IrTypeAbbreviation? {
         // Abbreviated type's classifier might not be TypeAliasDescriptor in case it's MockClassDescriptor (not found in dependencies).
-        val typeAliasDescriptor = constructor.declarationDescriptor.let {
-            it as? TypeAliasDescriptor
-        } ?: return null
+        val typeAliasDescriptor = constructor.declarationDescriptor as? TypeAliasDescriptor ?: return null
 
         if (!isTypeAliasAccessibleHere(typeAliasDescriptor)) return null
 

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/mangle/ManglerChecker.kt

@@ -33,8 +33,7 @@ class ManglerChecker(vararg _manglers: KotlinMangler<IrDeclaration>) : IrElement
 
             if (declaration.parent is IrPackageFragment) {
                 val vis = declaration as IrDeclarationWithVisibility
-                if (vis.visibility == DescriptorVisibilities.PRIVATE) return true
-                else return false
+                return DescriptorVisibilities.isPrivate(vis.visibility)
             }
 
             return declaration.parent.accept(this, data)