[builtins] move PromiseBuiltinsAssembler to it's own header file

src/builtins/builtins-promise.cc

Index: src/builtins/builtins-promise.cc
diff --git a/src/builtins/builtins-promise.cc b/src/builtins/builtins-promise.cc
index 9b1211bf205e994e203f3d36a36d86791fd6ff6b..0e8fb6925b879f4bfd8924b201b8c6e357b35ebe 100644
--- a/src/builtins/builtins-promise.cc
+++ b/src/builtins/builtins-promise.cc
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "src/builtins/builtins-promise.h"
 #include "src/builtins/builtins-utils.h"
 #include "src/builtins/builtins.h"
 #include "src/code-factory.h"
@@ -15,36 +16,6 @@ typedef compiler::Node Node;
 typedef CodeStubAssembler::ParameterMode ParameterMode;
 typedef compiler::CodeAssemblerState CodeAssemblerState;
 
-class PromiseBuiltinsAssembler : public CodeStubAssembler {
- public:
-  explicit PromiseBuiltinsAssembler(CodeAssemblerState* state)
-      : CodeStubAssembler(state) {}
-
- protected:
-  Node* ThrowIfNotJSReceiver(Node* context, Node* value,
-                             MessageTemplate::Template msg_template);
-
-  Node* SpeciesConstructor(Node* context, Node* object,
-                           Node* default_constructor);
-
-  Node* PromiseHasHandler(Node* promise);
-
-  void PromiseSetHasHandler(Node* promise);
-
-  void AppendPromiseCallback(int offset, compiler::Node* promise,
-                             compiler::Node* value);
-
-  Node* InternalPerformPromiseThen(Node* context, Node* promise,
-                                   Node* on_resolve, Node* on_reject,
-                                   Node* deferred);
-
-  void InternalResolvePromise(Node* context, Node* promise, Node* result,
-                              Label* out);
-
-  void BranchIfFastPath(Node* context, Node* promise, Label* if_isunmodified,
-                        Label* if_ismodified);
-};
-
 Node* PromiseBuiltinsAssembler::ThrowIfNotJSReceiver(
     Node* context, Node* value, MessageTemplate::Template msg_template) {
   Label out(this), throw_exception(this, Label::kDeferred);