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

src/compiler/code-assembler.cc

Index: src/compiler/code-assembler.cc
diff --git a/src/compiler/code-assembler.cc b/src/compiler/code-assembler.cc
index 6ecc45930ecdc8a9f90e0b1f3c912453d20d9a39..0aa69cdb4c7c895f4a4f604de3433e3512056e1d 100644
--- a/src/compiler/code-assembler.cc
+++ b/src/compiler/code-assembler.cc
@@ -187,6 +187,10 @@ 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);
 }