WIP [esnext] implement async iteration proposal

src/compiler/js-operator.h

Index: src/compiler/js-operator.h
diff --git a/src/compiler/js-operator.h b/src/compiler/js-operator.h
index b9902931fc88aa56a92ae12aeccd76581ee30dbe..6088a9033a2c17f47fc1466bfc0dde51925dccc3 100644
--- a/src/compiler/js-operator.h
+++ b/src/compiler/js-operator.h
@@ -489,6 +489,31 @@ std::ostream& operator<<(std::ostream&, CreateLiteralParameters const&);
 
 const CreateLiteralParameters& CreateLiteralParametersOf(const Operator* op);
 
+enum class SuspendType { kYield, kAwait };
+class GeneratorStoreParameters final {
+ public:
+  GeneratorStoreParameters(int register_count, SuspendType suspend_type)
+      : register_count_(register_count), suspend_type_(suspend_type) {}
+
+  int register_count() const { return register_count_; }
+  SuspendType suspend_type() const { return suspend_type_; }
+
+ private:
+  int register_count_;
+  SuspendType suspend_type_;
+};
+
+bool operator==(GeneratorStoreParameters const&,
+                GeneratorStoreParameters const&);
+bool operator!=(GeneratorStoreParameters const&,
+                GeneratorStoreParameters const&);
+
+size_t hash_value(GeneratorStoreParameters const&);
+
+std::ostream& operator<<(std::ostream&, GeneratorStoreParameters const&);
+
+const GeneratorStoreParameters& GeneratorStoreParametersOf(const Operator* op);
+
 BinaryOperationHint BinaryOperationHintOf(const Operator* op);
 
 CompareOperationHint CompareOperationHintOf(const Operator* op);
@@ -600,8 +625,8 @@ class V8_EXPORT_PRIVATE JSOperatorBuilder final
   const Operator* LoadMessage();
   const Operator* StoreMessage();
 
-  // Used to implement Ignition's SuspendGenerator bytecode.
-  const Operator* GeneratorStore(int register_count);
+  // Used to implement Ignition's SuspendGenerator / AwaitGenerator bytecode.
+  const Operator* GeneratorStore(int register_count, SuspendType suspend_type);
 
   // Used to implement Ignition's ResumeGenerator bytecode.
   const Operator* GeneratorRestoreContinuation();