Move generator-close on exception from the generator function to the GeneratorResume builtin.

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 1058 matching lines @@
   V8_INLINE PreParserStatement RewriteTryStatement(
       PreParserStatement try_block, PreParserStatement catch_block,
       PreParserStatement finally_block, const CatchInfo& catch_info, int pos) {
     return PreParserStatement::Default();
   }
 
   V8_INLINE void ParseAndRewriteGeneratorFunctionBody(
       int pos, FunctionKind kind, PreParserStatementList body, bool* ok) {
     ParseStatementList(body, Token::RBRACE, ok);
   }
+  V8_INLINE void ParseAndRewriteAsyncGeneratorFunctionBody(
+      int pos, FunctionKind kind, PreParserStatementList body, bool* ok) {
+    ParseStatementList(body, Token::RBRACE, ok);
+  }
   V8_INLINE void CreateFunctionNameAssignment(
       PreParserIdentifier function_name, int pos,
       FunctionLiteral::FunctionType function_type,
       DeclarationScope* function_scope, PreParserStatementList result,
       int index) {}
 
   V8_INLINE PreParserExpression RewriteDoExpression(PreParserStatement body,
                                                     int pos, bool* ok) {
     return PreParserExpression::Default();
   }
@@ skipping 193 matching lines @@
                                                         Token::Value op,
                                                         int pos) {
     return false;
   }
 
   V8_INLINE PreParserExpression BuildUnaryExpression(
       PreParserExpression expression, Token::Value op, int pos) {
     return PreParserExpression::Default();
   }
 
-  V8_INLINE PreParserExpression BuildIteratorResult(PreParserExpression value,
-                                                    bool done) {
-    return PreParserExpression::Default();
-  }
-
   V8_INLINE PreParserStatement
   BuildInitializationBlock(DeclarationParsingResult* parsing_result,
                            ZoneList<const AstRawString*>* names, bool* ok) {
     for (auto declaration : parsing_result->declarations) {
       DeclareAndInitializeVariables(PreParserStatement::Default(),
                                     &(parsing_result->descriptor), &declaration,
                                     names, ok);
     }
     return PreParserStatement::Default();
   }
@@ skipping 418 matching lines @@
 PreParserExpression PreParser::CloseTemplateLiteral(TemplateLiteralState* state,
                                                     int start,
                                                     PreParserExpression tag) {
   return EmptyExpression();
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PREPARSER_H