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

src/builtins/builtins-promise.h

Index: src/builtins/builtins-promise.h
diff --git a/src/builtins/builtins-promise.h b/src/builtins/builtins-promise.h
new file mode 100644
index 0000000000000000000000000000000000000000..d4a7ab54c1332d72bd86fb5a2214fb06e12b0014
--- /dev/null
+++ b/src/builtins/builtins-promise.h
@@ -0,0 +1,44 @@
+// 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/code-stub-assembler.h"
+
+namespace v8 {
+namespace internal {
+
+typedef compiler::Node Node;
+typedef CodeStubAssembler::ParameterMode ParameterMode;
+typedef compiler::CodeAssemblerState CodeAssemblerState;
+
+class PromiseBuiltinsAssembler : public CodeStubAssembler {
+ public:
+  explicit PromiseBuiltinsAssembler(CodeAssemblerState* state)
+      : CodeStubAssembler(state) {}
+
+  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);
+};
+
+}  // namespace internal
+}  // namespace v8