[es6] parse arrow ConciseBody with accept_IN flag

src/objects-inl.h

 // Copyright 2012 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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 5806 matching lines @@
                uses_arguments,
                kUsesArguments)
 BOOL_ACCESSORS(SharedFunctionInfo,
                compiler_hints,
                has_duplicate_parameters,
                kHasDuplicateParameters)
 BOOL_ACCESSORS(SharedFunctionInfo, compiler_hints, asm_function, kIsAsmFunction)
 BOOL_ACCESSORS(SharedFunctionInfo, compiler_hints, deserialized, kDeserialized)
 BOOL_ACCESSORS(SharedFunctionInfo, compiler_hints, never_compiled,
                kNeverCompiled)
-
+BOOL_ACCESSORS(SharedFunctionInfo, compiler_hints, accept_IN, kAcceptIn)
 
 #if V8_HOST_ARCH_32_BIT
 SMI_ACCESSORS(SharedFunctionInfo, length, kLengthOffset)
 SMI_ACCESSORS(SharedFunctionInfo, internal_formal_parameter_count,
               kFormalParameterCountOffset)
 SMI_ACCESSORS(SharedFunctionInfo, expected_nof_properties,
               kExpectedNofPropertiesOffset)
 SMI_ACCESSORS(SharedFunctionInfo, num_literals, kNumLiteralsOffset)
 SMI_ACCESSORS(SharedFunctionInfo, start_position_and_type,
               kStartPositionAndTypeOffset)
@@ skipping 2289 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_