Move: Fix exception on moving top-level declaration from/to script file

#KT-20260 Fixed

compiler/psi/src/org/jetbrains/kotlin/psi/psiUtil/ktPsiUtil.kt

@@ -578,4 +578,13 @@ fun KtNamedDeclaration.safeFqNameForLazyResolve(): FqName? {
     //NOTE: should only create special names for package level declarations, so we can safely rely on real fq name for parent
     val parentFqName = KtNamedDeclarationUtil.getParentFqName(this)
     return parentFqName?.child(safeNameForLazyResolve())
+}
+
+fun isTopLevelInFileOrScript(element: PsiElement): Boolean {
+    val parent = element.parent
+    return when (parent) {
+        is KtFile -> true
+        is KtBlockExpression -> parent.parent is KtScript
+        else -> false
+    }
 }