[debugger] step-next across yield should not leave the generator.

src/runtime/runtime-generator.cc

Index: src/runtime/runtime-generator.cc
diff --git a/src/runtime/runtime-generator.cc b/src/runtime/runtime-generator.cc
index bb63a3d0d01ac2eccb3d4fe0b602dd89d711e7c3..e70ad22bace16c2a21d4ae6e2c31feb3a2264b14 100644
--- a/src/runtime/runtime-generator.cc
+++ b/src/runtime/runtime-generator.cc
@@ -54,7 +54,7 @@ RUNTIME_FUNCTION(Runtime_SuspendJSGeneratorObject) {
   DCHECK(frame->function()->shared()->is_compiled());
   DCHECK(!frame->function()->IsOptimized());
 
-  isolate->debug()->RecordAsyncFunction(generator_object);
+  isolate->debug()->RecordGenerator(generator_object);
 
   // The caller should have saved the context and continuation already.
   DCHECK_EQ(generator_object->context(), Context::cast(frame->context()));