[ignition] Optimize JSGenerator creation

src/builtins/builtins-definitions.h

 // Copyright 2017 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_BUILTINS_BUILTINS_DEFINITIONS_H_
 #define V8_BUILTINS_BUILTINS_DEFINITIONS_H_
 
 namespace v8 {
 namespace internal {
 
@@ skipping 476 matching lines @@
   ASM(FunctionPrototypeCall)                                                   \
   /* ES6 #sec-function.prototype-@@hasinstance */                              \
   TFJ(FunctionPrototypeHasInstance, 1, kV)                                     \
   /* ES6 #sec-function.prototype.tostring */                                   \
   CPP(FunctionPrototypeToString)                                               \
                                                                                \
   /* Belongs to Objects but is a dependency of GeneratorPrototypeResume */     \
   TFS(CreateIterResultObject, kValue, kDone)                                   \
                                                                                \
   /* Generator and Async */                                                    \
+  TFS(CreateGeneratorObject, kClosure, kReceiver)                              \
   CPP(GeneratorFunctionConstructor)                                            \
   /* ES6 #sec-generator.prototype.next */                                      \
   TFJ(GeneratorPrototypeNext, 1, kValue)                                       \
   /* ES6 #sec-generator.prototype.return */                                    \
   TFJ(GeneratorPrototypeReturn, 1, kValue)                                     \
   /* ES6 #sec-generator.prototype.throw */                                     \
   TFJ(GeneratorPrototypeThrow, 1, kException)                                  \
   CPP(AsyncFunctionConstructor)                                                \
                                                                                \
   /* Global object */                                                          \
@@ skipping 549 matching lines @@
 #define BUILTIN_LIST_TFS(V)                                                    \
   BUILTIN_LIST(IGNORE_BUILTIN, IGNORE_BUILTIN, IGNORE_BUILTIN, IGNORE_BUILTIN, \
                V, IGNORE_BUILTIN, IGNORE_BUILTIN, IGNORE_BUILTIN)
 
 #define BUILTINS_WITH_UNTAGGED_PARAMS(V) V(WasmCompileLazy)
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_BUILTINS_BUILTINS_DEFINITIONS_H_