[cfe][InternalNodes] Move type arguments to TypeArguments

This adds a TypeArguments class to the internal ast nodes and moves the type arguments ArgumentsImpl to this class.

Change-Id: I86ebff7197ffc641c5083941316c54c728b56c66
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/467580
Reviewed-by: Jens Johansen <jensj@google.com>
Commit-Queue: Johnni Winther <johnniwinther@google.com>

Author: johnniwinther

pkg/front_end/analysis_options.yaml

@@ -24,4 +24,5 @@ linter:
     - unrelated_type_equality_checks
     - annotate_overrides
     - always_declare_return_types
+    - deprecated_member_use_from_same_package
     # - always_specify_types

pkg/front_end/lib/src/fragment/constructor/encoding.dart

@@ -802,8 +802,10 @@ class _ExtensionTypeInitializerToStatementConverter
         new ExpressionStatement(
           new VariableSet(
             thisVariable,
-            new StaticInvocation(node.target, node.arguments.toArguments())
-              ..fileOffset = node.fileOffset,
+            new StaticInvocation(
+              node.target,
+              node.arguments.toArguments(node.inferredTypeArguments),
+            )..fileOffset = node.fileOffset,
           )..fileOffset = node.fileOffset,
         )..fileOffset = node.fileOffset,
       );

pkg/front_end/lib/src/fragment/enum_element.dart

@@ -325,16 +325,17 @@ class EnumElementDeclaration
       new IntLiteral(elementIndex),
       new StringLiteral(constant),
     ];
-    List<DartType>? typeArguments;
+    TypeArguments? typeArguments;
     List<TypeBuilder>? typeArgumentBuilders =
         _fragment.constructorReferenceBuilder?.typeArguments;
     if (typeArgumentBuilders != null) {
-      typeArguments = <DartType>[];
+      List<DartType> types = [];
       for (TypeBuilder typeBuilder in typeArgumentBuilders) {
-        typeArguments.add(
+        types.add(
           typeBuilder.build(libraryBuilder, TypeUse.constructorTypeArgument),
         );
       }
+      typeArguments = new TypeArguments(types);
     }
     if (result != null && result.isInvalidLookup) {
       assert(