ClsWrapperStubPsiFactory can be a singleton

compiler/light-classes/src/org/jetbrains/kotlin/asJava/ClsWrapperStubPsiFactory.java

@@ -31,8 +31,12 @@ import org.jetbrains.annotations.Nullable;
 
 public class ClsWrapperStubPsiFactory extends StubPsiFactory {
     public static final Key<LightElementOrigin> ORIGIN = Key.create("ORIGIN");
+    public static final ClsWrapperStubPsiFactory INSTANCE = new ClsWrapperStubPsiFactory();
+
     private final StubPsiFactory delegate = new ClsStubPsiFactory();
 
+    private ClsWrapperStubPsiFactory() { }
+
     @Nullable
     public static LightMemberOriginForDeclaration getMemberOrigin(@NotNull PsiMember member) {
         if (member instanceof ClsRepositoryPsiElement<?>) {

compiler/light-classes/src/org/jetbrains/kotlin/asJava/LightClassDataProvider.kt

@@ -127,7 +127,7 @@ abstract class LightClassDataProvider<T : WithFileStubAndExtraDiagnostics>(
 
     private fun createJavaFileStub(packageFqName: FqName, files: Collection<KtFile>): PsiJavaFileStub {
         val javaFileStub = PsiJavaFileStubImpl(packageFqName.asString(), true)
-        javaFileStub.psiFactory = ClsWrapperStubPsiFactory()
+        javaFileStub.psiFactory = ClsWrapperStubPsiFactory.INSTANCE
 
         val manager = PsiManager.getInstance(project)