[csa] Refactor promises API

src/code-stub-assembler.h

 // 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.
 
 #ifndef V8_CODE_STUB_ASSEMBLER_H_
 #define V8_CODE_STUB_ASSEMBLER_H_
 
 #include <functional>
 
 #include "src/compiler/code-assembler.h"
@@ skipping 1110 matching lines @@
 
   Node* ElementOffsetFromIndex(Node* index, ElementsKind kind,
                                ParameterMode mode, int base_size = 0);
 
   Node* AllocateFunctionWithMapAndContext(Node* map, Node* shared_info,
                                           Node* context);
 
   // Promise helpers
   Node* IsPromiseHookEnabled();
 
-  Node* AllocateJSPromise(Node* context);
-  void PromiseInit(Node* promise);
-
-  // Other promise fields may also be need to set/reset. This only
-  // provides a helper for certain init patterns.
-  void PromiseSet(Node* promise, Node* status, Node* result);
-
   Node* AllocatePromiseReactionJobInfo(Node* promise, Node* value, Node* tasks,
                                        Node* deferred_promise,
                                        Node* deferred_on_resolve,
                                        Node* deferred_on_reject, Node* context);
 
  protected:
   void DescriptorLookupLinear(Node* unique_name, Node* descriptors, Node* nof,
                               Label* if_found, Variable* var_name_index,
                               Label* if_not_found);
 
@@ skipping 111 matching lines @@
   }
 #else
 #define CSA_SLOW_ASSERT(csa, x) ((void)0)
 #endif
 
 DEFINE_OPERATORS_FOR_FLAGS(CodeStubAssembler::AllocationFlags);
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_CODE_STUB_ASSEMBLER_H_