[async-iteration] implement Async-from-Sync Iterator

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>
 
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   // ===========================================================================
 
   // Constants.
   Node* Int32Constant(int32_t value);
   Node* Int64Constant(int64_t value);
   Node* IntPtrConstant(intptr_t value);
   Node* NumberConstant(double value);
   Node* SmiConstant(Smi* value);
   Node* SmiConstant(int value);
   Node* HeapConstant(Handle<HeapObject> object);
+  Node* CStringConstant(const char* str);
   Node* BooleanConstant(bool value);
   Node* ExternalConstant(ExternalReference address);
   Node* Float64Constant(double value);
   Node* NaNConstant();
 
   bool ToInt32Constant(Node* node, int32_t& out_value);
   bool ToInt64Constant(Node* node, int64_t& out_value);
   bool ToSmiConstant(Node* node, Smi*& out_value);
   bool ToIntPtrConstant(Node* node, intptr_t& out_value);
 
@@ skipping 281 matching lines @@
   CodeAssemblerCallback call_epilogue_;
 
   DISALLOW_COPY_AND_ASSIGN(CodeAssemblerState);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_ASSEMBLER_H_