Teach Scopes whether they will end up being lazily compiled or not

src/parsing/preparser.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_PREPARSER_H
 #define V8_PARSING_PREPARSER_H
 
 #include "src/ast/scopes.h"
 #include "src/parsing/parser-base.h"
 
@@ skipping 844 matching lines @@
     UNREACHABLE();
     return kLazyParsingComplete;
   }
   Expression ParseFunctionLiteral(
       Identifier name, Scanner::Location function_name_location,
       FunctionNameValidity function_name_validity, FunctionKind kind,
       int function_token_pos, FunctionLiteral::FunctionType function_type,
       LanguageMode language_mode, bool* ok);
   LazyParsingResult ParseLazyFunctionLiteralBody(bool may_abort, bool* ok);
 
+  bool ShouldCompileLazily(PreParserExpression fun) {
+    USE(fun);
+    return true;
+  }
+
   struct TemplateLiteralState {};
 
   V8_INLINE TemplateLiteralState OpenTemplateLiteral(int pos) {
     return TemplateLiteralState();
   }
   V8_INLINE void AddTemplateExpression(TemplateLiteralState* state,
                                        PreParserExpression expression) {}
   V8_INLINE void AddTemplateSpan(TemplateLiteralState* state, bool tail) {}
   V8_INLINE PreParserExpression CloseTemplateLiteral(
       TemplateLiteralState* state, int start, PreParserExpression tag);
@@ skipping 604 matching lines @@
     function_state_->NextMaterializedLiteralIndex();
     function_state_->NextMaterializedLiteralIndex();
   }
   return EmptyExpression();
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PREPARSER_H