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

src/interpreter/interpreter.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/interpreter/interpreter.h"
 
 #include <fstream>
 #include <memory>
 
 #include "src/ast/prettyprinter.h"
@@ skipping 2748 matching lines @@
 
   Node* offset = __ SmiTag(__ BytecodeOffset());
   __ StoreObjectField(generator, JSGeneratorObject::kInputOrDebugPosOffset,
                       offset);
 
   __ Dispatch();
 
   __ Bind(&if_stepping);
   {
     Node* context = __ GetContext();
-    __ CallRuntime(Runtime::kDebugRecordAsyncFunction, context, generator);
+    __ CallRuntime(Runtime::kDebugRecordGenerator, context, generator);
     __ Goto(&ok);
   }
 }
 
 // ResumeGenerator <generator>
 //
 // Imports the register file stored in the generator. Also loads the
 // generator's state and stores it in the accumulator, before overwriting it
 // with kGeneratorExecuting.
 void Interpreter::DoResumeGenerator(InterpreterAssembler* assembler) {
   Node* generator_reg = __ BytecodeOperandReg(0);
   Node* generator = __ LoadRegister(generator_reg);
 
   __ ImportRegisterFile(
       __ LoadObjectField(generator, JSGeneratorObject::kOperandStackOffset));
 
   Node* old_state =
       __ LoadObjectField(generator, JSGeneratorObject::kContinuationOffset);
   Node* new_state = __ Int32Constant(JSGeneratorObject::kGeneratorExecuting);
   __ StoreObjectField(generator, JSGeneratorObject::kContinuationOffset,
       __ SmiTag(new_state));
   __ SetAccumulator(old_state);
 
   __ Dispatch();
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8