Optimize class names computation in Java package for CLI

Use known class names' set if it exists

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/descriptors/LazyJavaPackageScope.kt

@@ -140,6 +140,9 @@ class LazyJavaPackageScope(
         // neither objects nor enum members can be in java package
         if (!kindFilter.acceptsKinds(DescriptorKindFilter.NON_SINGLETON_CLASSIFIERS_MASK)) return emptySet()
 
+        val knownClassNamesInPackage = knownClassNamesInPackage()
+        if (knownClassNamesInPackage != null) return knownClassNamesInPackage.mapTo(HashSet()) { Name.identifier(it) }
+
         return jPackage.getClasses(nameFilter ?: alwaysTrue()).mapNotNullTo(linkedSetOf()) { klass ->
             if (klass.lightClassOriginKind == LightClassOriginKind.SOURCE) null else klass.name
         }