[element model] migrate constant_evaluator

Change-Id: I3fe86094fbd5e5ceb51d5ff32996a29e5bc77521
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/401966
Reviewed-by: Brian Wilkerson <[email protected]>
Commit-Queue: Brian Wilkerson <[email protected]>

Author: pq

pkg/analyzer/analyzer_use_new_elements.txt

@@ -18,7 +18,6 @@ lib/src/dart/analysis/search.dart
 lib/src/dart/analysis/session.dart
 lib/src/dart/analysis/session_helper.dart
 lib/src/dart/ast/ast.dart
-lib/src/dart/ast/constant_evaluator.dart
 lib/src/dart/ast/element_locator.dart
 lib/src/dart/ast/extensions.dart
 lib/src/dart/ast/utilities.dart

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

@@ -7,7 +7,7 @@ import 'dart:collection';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
-import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer/dart/element/element2.dart';
 
 /// Instances of the class [ConstantEvaluator] evaluate constant expressions to
 /// produce their compile-time value.
@@ -391,7 +391,7 @@ class ConstantEvaluator extends GeneralizingAstVisitor<Object> {
 
   /// Return the constant value of the static constant represented by the given
   /// [element].
-  Object _getConstantValue(Element? element) {
+  Object _getConstantValue(Element2? element) {
     // TODO(brianwilkerson): Implement this
 //    if (element is FieldElement) {
 //      FieldElement field = element;