[promises] port NewPromiseCapability to TF

src/compiler/code-assembler.h

 // Copyright 2015 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_COMPILER_CODE_ASSEMBLER_H_
 #define V8_COMPILER_CODE_ASSEMBLER_H_
 
 #include <map>
 #include <memory>
 
@@ skipping 332 matching lines @@
                                  Node* target, TArgs... args);
 
   template <class... TArgs>
   Node* CallJS(Callable const& callable, Node* context, Node* function,
                Node* receiver, TArgs... args) {
     int argc = static_cast<int>(sizeof...(args));
     Node* arity = Int32Constant(argc);
     return CallStub(callable, context, function, arity, receiver, args...);
   }
 
+  template <class... TArgs>
+  Node* ConstructJS(Callable const& callable, Node* context, Node* new_target,
+                    TArgs... args) {
+    int argc = static_cast<int>(sizeof...(args));
+    Node* arity = Int32Constant(argc);
+    Node* receiver = LoadRoot(Heap::kUndefinedValueRootIndex);
+
+    // Construct(target, new_target, arity, receiver, arguments...)
+    return CallStub(callable, context, new_target, new_target, arity, receiver,
+                    args...);
+  }
+
   // Call to a C function with two arguments.
   Node* CallCFunction2(MachineType return_type, MachineType arg0_type,
                        MachineType arg1_type, Node* function, Node* arg0,
                        Node* arg1);
 
   // Call to a C function with three arguments.
   Node* CallCFunction3(MachineType return_type, MachineType arg0_type,
                        MachineType arg1_type, MachineType arg2_type,
                        Node* function, Node* arg0, Node* arg1, Node* arg2);
 
@@ skipping 92 matching lines @@
                      Code::Flags flags, const char* name,
                      size_t result_size = 1);
 
   // Create with JSCall linkage.
   CodeAssemblerState(Isolate* isolate, Zone* zone, int parameter_count,
                      Code::Flags flags, const char* name);
 
   ~CodeAssemblerState();
 
   const char* name() const { return name_; }
+  int parameter_count() const;
 
  private:
   friend class CodeAssembler;
   friend class CodeAssemblerLabel;
   friend class CodeAssemblerVariable;
 
   CodeAssemblerState(Isolate* isolate, Zone* zone,
                      CallDescriptor* call_descriptor, Code::Flags flags,
                      const char* name);
 
   std::unique_ptr<RawMachineAssembler> raw_assembler_;
   Code::Flags flags_;
   const char* name_;
   bool code_generated_;
   ZoneSet<CodeAssemblerVariable::Impl*> variables_;
 
   DISALLOW_COPY_AND_ASSIGN(CodeAssemblerState);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_ASSEMBLER_H_