Move generator-close on exception from the generator function to the GeneratorResume builtin.

src/ast/ast.h

Index: src/ast/ast.h
diff --git a/src/ast/ast.h b/src/ast/ast.h
index 93189d5f622043326f5f9f425dd83a2fc6840a4d..aab6b5f35a766d29babdd074c1a3612b7b6427bf 100644
--- a/src/ast/ast.h
+++ b/src/ast/ast.h
@@ -2542,6 +2542,10 @@ class Suspend final : public Expression {
     return suspend_id() > 0 && (flags() & SuspendFlags::kAsyncGeneratorAwait) ==
                                    SuspendFlags::kAsyncGenerator;
   }
+  inline bool IsNonInitialGeneratorYield() const {
+    // Return true if is_generator() && !is_await() && yield_id() > 0
+    return suspend_id() > 0 && (flags() == SuspendFlags::kGeneratorYield);
+  }
 
   void set_generator_object(Expression* e) { generator_object_ = e; }
   void set_expression(Expression* e) { expression_ = e; }