[builtins] Add EmitFastNewObject

src/builtins/builtins-regexp.cc

 // Copyright 2016 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.
 
+#include "src/builtins/builtins-constructor.h"
 #include "src/builtins/builtins-utils.h"
 #include "src/builtins/builtins.h"
 #include "src/code-factory.h"
 #include "src/code-stub-assembler.h"
 #include "src/regexp/jsregexp.h"
 #include "src/regexp/regexp-utils.h"
 #include "src/string-builder.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 764 matching lines @@
     {
       Node* const initial_map = LoadObjectField(
           regexp_function, JSFunction::kPrototypeOrInitialMapOffset);
       Node* const regexp = AllocateJSObjectFromMap(initial_map);
       var_regexp.Bind(regexp);
       Goto(&next);
     }
 
     Bind(&allocate_generic);
     {
-      Callable fastnewobject_callable = CodeFactory::FastNewObject(isolate);
-      Node* const regexp = CallStub(fastnewobject_callable, context,
-                                    regexp_function, var_new_target.value());
+      ConstructorBuiltinsAssembler constructor_assembler(this->state());
+      Node* const regexp = constructor_assembler.EmitFastNewObject(
+          context, regexp_function, var_new_target.value());
       var_regexp.Bind(regexp);
       Goto(&next);
     }
 
     Bind(&next);
   }
 
   Node* const result = RegExpInitialize(context, var_regexp.value(),
                                         var_pattern.value(), var_flags.value());
   Return(result);
@@ skipping 1719 matching lines @@
   Bind(&if_matched);
   {
     Node* result =
         ConstructNewResultFromMatchInfo(context, match_indices, string);
     Return(result);
   }
 }
 
 }  // namespace internal
 }  // namespace v8