Always immediately propagate flags outwards rather than relying on PropagateScopeInfo

src/parsing/parser-base.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_PARSING_PARSER_BASE_H
 #define V8_PARSING_PARSER_BASE_H
 
 #include "src/ast/scopes.h"
 #include "src/bailout-reason.h"
 #include "src/base/hashmap.h"
@@ skipping 3442 matching lines @@
     function_state.SkipMaterializedLiterals(
         formal_parameters.materialized_literals_count);
 
     this->ReindexLiterals(formal_parameters);
 
     Expect(Token::ARROW, CHECK_OK);
 
     if (peek() == Token::LBRACE) {
       // Multiple statement body
       Consume(Token::LBRACE);
-      bool is_lazily_parsed =
-          (mode() == PARSE_LAZILY && scope()->AllowsLazyParsing());
+      DCHECK_EQ(scope(), formal_parameters.scope);
+      bool is_lazily_parsed = (mode() == PARSE_LAZILY &&
+                               formal_parameters.scope->AllowsLazyParsing());
       if (is_lazily_parsed) {
         body = this->NewStatementList(0, zone());
         this->SkipLazyFunctionBody(&materialized_literal_count,
                                    &expected_property_count, CHECK_OK);
         if (formal_parameters.materialized_literals_count > 0) {
           materialized_literal_count +=
               formal_parameters.materialized_literals_count;
         }
       } else {
         body = this->ParseEagerFunctionBody(
@@ skipping 279 matching lines @@
     has_seen_constructor_ = true;
     return;
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_BASE_H