Reland of Preparse functions in the scope that was created when parsing of the function was started

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/ast.h"
 #include "src/ast/scopes.h"
 #include "src/bailout-reason.h"
@@ skipping 363 matching lines @@
     kInsideValidBlock,
 
     // Tail call expressions are not allowed in the following blocks.
     kInsideTryBlock,
     kInsideForInOfBody,
   };
 
   class FunctionState final : public ScopeState {
    public:
     FunctionState(FunctionState** function_state_stack,
-                  ScopeState** scope_stack, Scope* scope, FunctionKind kind);
+                  ScopeState** scope_stack, DeclarationScope* scope,
+                  FunctionKind kind);
     ~FunctionState();
 
+    DeclarationScope* scope() const {
+      return ScopeState::scope()->AsDeclarationScope();
+    }
+
     int NextMaterializedLiteralIndex() {
       return next_materialized_literal_index_++;
     }
     int materialized_literal_count() {
       return next_materialized_literal_index_;
     }
 
     void SkipMaterializedLiterals(int count) {
       next_materialized_literal_index_ += count;
     }
@@ skipping 1045 matching lines @@
   bool allow_harmony_restrictive_generators_;
   bool allow_harmony_trailing_commas_;
   bool allow_harmony_class_fields_;
 
   friend class DiscardableZoneScope;
 };
 
 template <typename Impl>
 ParserBase<Impl>::FunctionState::FunctionState(
     FunctionState** function_state_stack, ScopeState** scope_stack,
-    Scope* scope, FunctionKind kind)
+    DeclarationScope* scope, FunctionKind kind)
     : ScopeState(scope_stack, scope),
       next_materialized_literal_index_(0),
       expected_property_count_(0),
       kind_(kind),
       generator_object_variable_(nullptr),
       promise_variable_(nullptr),
       function_state_stack_(function_state_stack),
       outer_function_state_(*function_state_stack),
       destructuring_assignments_to_rewrite_(16, scope->zone()),
       tail_call_expressions_(scope->zone()),
@@ skipping 3858 matching lines @@
     has_seen_constructor_ = true;
     return;
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_BASE_H