Remove unnecessary List creation

pkg/analyzer/lib/src/generated/ast.dart

Index: pkg/analyzer/lib/src/generated/ast.dart
diff --git a/pkg/analyzer/lib/src/generated/ast.dart b/pkg/analyzer/lib/src/generated/ast.dart
index bb44db5d5b3ccdd49d072ada95d431440bd68955..8be10192d2f312a27606e34b543aacdc639940c9 100644
--- a/pkg/analyzer/lib/src/generated/ast.dart
+++ b/pkg/analyzer/lib/src/generated/ast.dart
@@ -197,12 +197,10 @@ abstract class AnnotatedNode extends AstNode {
    *         appeared in the original source
    */
   List<AstNode> get sortedCommentAndAnnotations {
-    List<AstNode> childList = new List<AstNode>();
-    childList.add(_comment);
-    childList.addAll(_metadata);
-    List<AstNode> children = new List.from(childList);
-    children.sort(AstNode.LEXICAL_ORDER);
-    return children;
+    return <AstNode>[]
+      ..add(_comment)
+      ..addAll(_metadata)
+      ..sort(AstNode.LEXICAL_ORDER);
   }
 }
 
@@ -4325,12 +4323,10 @@ class CompilationUnit extends AstNode {
    *         appeared in the original source
    */
   List<AstNode> get sortedDirectivesAndDeclarations {
-    List<AstNode> childList = new List<AstNode>();
-    childList.addAll(_directives);
-    childList.addAll(_declarations);
-    List<AstNode> children = new List.from(childList);
-    children.sort(AstNode.LEXICAL_ORDER);
-    return children;
+    return <AstNode>[]
+      ..addAll(_directives)
+      ..addAll(_declarations)
+      ..sort(AstNode.LEXICAL_ORDER);
   }
 }
 
@@ -13231,12 +13227,10 @@ abstract class NormalFormalParameter extends FormalParameter {
    *         appeared in the original source
    */
   List<AstNode> get sortedCommentAndAnnotations {
-    List<AstNode> childList = new List<AstNode>();
-    childList.add(_comment);
-    childList.addAll(_metadata);
-    List<AstNode> children = new List.from(childList);
-    children.sort(AstNode.LEXICAL_ORDER);
-    return children;
+    return <AstNode>[]
+      ..add(_comment)
+      ..addAll(_metadata)
+      ..sort(AstNode.LEXICAL_ORDER);
   }
 }