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

src/interpreter/bytecode-generator.h

 // 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.
 
 #ifndef V8_INTERPRETER_BYTECODE_GENERATOR_H_
 #define V8_INTERPRETER_BYTECODE_GENERATOR_H_
 
 #include "src/ast/ast.h"
 #include "src/interpreter/bytecode-array-builder.h"
 #include "src/interpreter/bytecode-label.h"
@@ skipping 87 matching lines @@
                          HoleCheckMode hole_check_mode,
                          TypeofMode typeof_mode = NOT_INSIDE_TYPEOF);
   void BuildVariableLoadForAccumulatorValue(
       Variable* variable, FeedbackSlot slot, HoleCheckMode hole_check_mode,
       TypeofMode typeof_mode = NOT_INSIDE_TYPEOF);
   void BuildVariableAssignment(Variable* variable, Token::Value op,
                                FeedbackSlot slot,
                                HoleCheckMode hole_check_mode);
 
   void BuildReturn();
+  void BuildAsyncReturn();
   void BuildReThrow();
   void BuildAbort(BailoutReason bailout_reason);
   void BuildThrowIfHole(Handle<String> name);
   void BuildThrowReferenceError(Handle<String> name);
   void BuildHoleCheckForVariableAssignment(Variable* variable, Token::Value op);
 
   // Build jump to targets[value], where
   // start_index <= value < start_index + size.
   void BuildIndexedJump(Register value, size_t start_index, size_t size,
                         ZoneVector<BytecodeLabel>& targets);
@@ skipping 107 matching lines @@
   Handle<Name> prototype_string_;
   Handle<FixedArray> empty_fixed_array_;
   const AstRawString* undefined_string_;
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_GENERATOR_H_