fix analyzer failing to resolve loop variable nodes

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

Index: pkg/analyzer/lib/src/dart/ast/utilities.dart
diff --git a/pkg/analyzer/lib/src/dart/ast/utilities.dart b/pkg/analyzer/lib/src/dart/ast/utilities.dart
index 4b9857d26245b8ce8330b8182f061e109cfe61ac..d23485ab07f77095e21b933cad898b20a5c2f58f 100644
--- a/pkg/analyzer/lib/src/dart/ast/utilities.dart
+++ b/pkg/analyzer/lib/src/dart/ast/utilities.dart
@@ -5752,6 +5752,7 @@ class ResolutionCopier implements AstVisitor<bool> {
         _isEqualTokens(node.forKeyword, toNode.forKeyword),
         _isEqualTokens(node.leftParenthesis, toNode.leftParenthesis),
         _isEqualNodes(node.loopVariable, toNode.loopVariable),
+        _isEqualNodes(node.identifier, toNode.identifier),
         _isEqualTokens(node.inKeyword, toNode.inKeyword),
         _isEqualNodes(node.iterable, toNode.iterable),
         _isEqualTokens(node.rightParenthesis, toNode.rightParenthesis),