[element model] migrate prefer_final_parameters

Bug: https://github.com/dart-lang/linter/issues/5099
Change-Id: Ia4dd49b4168d4223a27e81e66ca69249e2533cad
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/393165
Auto-Submit: Phil Quitslund <[email protected]>
Reviewed-by: Brian Wilkerson <[email protected]>
Commit-Queue: Brian Wilkerson <[email protected]>

Author: pq

pkg/linter/analyzer_use_new_elements.txt

@@ -137,6 +137,7 @@ lib/src/rules/prefer_equal_for_default_values.dart
 lib/src/rules/prefer_expression_function_bodies.dart
 lib/src/rules/prefer_final_in_for_each.dart
 lib/src/rules/prefer_final_locals.dart
+lib/src/rules/prefer_final_parameters.dart
 lib/src/rules/prefer_for_elements_to_map_fromIterable.dart
 lib/src/rules/prefer_foreach.dart
 lib/src/rules/prefer_function_declarations_over_variables.dart
@@ -179,6 +180,7 @@ lib/src/rules/tighten_type_of_initializing_formals.dart
 lib/src/rules/type_annotate_public_apis.dart
 lib/src/rules/type_init_formals.dart
 lib/src/rules/type_literal_in_constant_pattern.dart
+lib/src/rules/unawaited_futures.dart
 lib/src/rules/unintended_html_in_doc_comment.dart
 lib/src/rules/unnecessary_await_in_return.dart
 lib/src/rules/unnecessary_brace_in_string_interps.dart

pkg/linter/lib/src/rules/prefer_final_parameters.dart

@@ -71,11 +71,11 @@ class _Visitor extends SimpleAstVisitor<void> {
             param is SuperFormalParameter) {
           continue;
         }
-        var declaredElement = param.declaredElement;
+        var declaredElement = param.declaredFragment?.element;
         if (declaredElement != null &&
             !declaredElement.isInitializingFormal &&
             !declaredElement.isWildcardVariable &&
-            !body.isPotentiallyMutatedInScope(declaredElement)) {
+            !body.isPotentiallyMutatedInScope2(declaredElement)) {
           rule.reportLint(param, arguments: [param.name!.lexeme]);
         }
       }