[async-await] (simpler) fix for Return in try/finally in async functions

src/ast/ast.h

Index: src/ast/ast.h
diff --git a/src/ast/ast.h b/src/ast/ast.h
index 5e8255051f8bb556761ff0efe86a2c6b81a50152..cbba803983bc267a6287d0da907bd98d7f3d28c4 100644
--- a/src/ast/ast.h
+++ b/src/ast/ast.h
@@ -896,17 +896,22 @@ class BreakStatement final : public JumpStatement {
 
 class ReturnStatement final : public JumpStatement {
  public:
+  enum Type { kNormal, kHardReturn };
   Expression* expression() const { return expression_; }
 
   void set_expression(Expression* e) { expression_ = e; }
+  bool is_hard_return() const { return type_ == kHardReturn; }
 
  private:
   friend class AstNodeFactory;
 
-  ReturnStatement(Expression* expression, int pos)
-      : JumpStatement(pos, kReturnStatement), expression_(expression) {}
+  ReturnStatement(Expression* expression, Type type, int pos)
+      : JumpStatement(pos, kReturnStatement),
+        expression_(expression),
+        type_(type) {}
 
   Expression* expression_;
+  Type type_ = kNormal;
 };
 
 
@@ -3209,7 +3214,13 @@ class AstNodeFactory final BASE_EMBEDDED {
   }
 
   ReturnStatement* NewReturnStatement(Expression* expression, int pos) {
-    return new (zone_) ReturnStatement(expression, pos);
+    return new (zone_)
+        ReturnStatement(expression, ReturnStatement::kNormal, pos);
+  }
+
+  ReturnStatement* NewHardReturnStatement(Expression* expression, int pos) {
+    return new (zone_)
+        ReturnStatement(expression, ReturnStatement::kHardReturn, pos);
   }
 
   WithStatement* NewWithStatement(Scope* scope,