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

src/compiler/code-assembler.cc

 // 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.
 
 #include "src/compiler/code-assembler.h"
 
 #include <ostream>
 
 #include "src/code-factory.h"
 #include "src/compiler/graph.h"
@@ skipping 170 matching lines @@
 }
 
 Node* CodeAssembler::SmiConstant(int value) {
   return SmiConstant(Smi::FromInt(value));
 }
 
 Node* CodeAssembler::HeapConstant(Handle<HeapObject> object) {
   return raw_assembler()->HeapConstant(object);
 }
 
+Node* CodeAssembler::CStringConstant(const char* str) {
+  return HeapConstant(factory()->NewStringFromAsciiChecked(str, TENURED));
+}
+
 Node* CodeAssembler::BooleanConstant(bool value) {
   return raw_assembler()->BooleanConstant(value);
 }
 
 Node* CodeAssembler::ExternalConstant(ExternalReference address) {
   return raw_assembler()->ExternalConstant(address);
 }
 
 Node* CodeAssembler::Float64Constant(double value) {
   return raw_assembler()->Float64Constant(value);
@@ skipping 653 matching lines @@
       }
     }
   }
 
   bound_ = true;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8