Implement new Function.prototype.toString and fix CreateDynamicFunction parsing

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/ast.h"
 #include "src/ast/scopes.h"
 #include "src/parsing/parser-base.h"
@@ skipping 1653 matching lines @@
   }
 
   V8_INLINE ZoneList<PreParserExpression>* GetNonPatternList() const {
     return function_state_->non_patterns_to_rewrite();
   }
 
   V8_INLINE void CountUsage(v8::Isolate::UseCounterFeature feature) {
     if (use_counts_ != nullptr) ++use_counts_[feature];
   }
 
+  V8_INLINE bool ParsingDynamicFunctionDeclaration() const { return false; }
+
   // Preparser's private field members.
 
   int* use_counts_;
   bool track_unresolved_variables_;
   PreParserLogger log_;
   PendingCompilationErrorHandler* pending_error_handler_;
 };
 
 PreParserExpression PreParser::SpreadCall(PreParserExpression function,
                                           PreParserExpressionList args, int pos,
@@ skipping 16 matching lines @@
     function_state_->NextMaterializedLiteralIndex();
     function_state_->NextMaterializedLiteralIndex();
   }
   return EmptyExpression();
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PREPARSER_H