[es6] parse arrow ConciseBody with accept_IN flag

src/objects.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.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 6692 matching lines @@
 
   // Indicates that this function is an asm function.
   DECL_BOOLEAN_ACCESSORS(asm_function)
 
   // Indicates that the the shared function info is deserialized from cache.
   DECL_BOOLEAN_ACCESSORS(deserialized)
 
   // Indicates that the the shared function info has never been compiled before.
   DECL_BOOLEAN_ACCESSORS(never_compiled)
 
+  // Indicates (for non-eager compilation) that a function's body can be parsed
+  // accepting [In] grammar production variants.
+  DECL_BOOLEAN_ACCESSORS(accept_IN)
+
   inline FunctionKind kind();
   inline void set_kind(FunctionKind kind);
 
   // Indicates whether or not the code in the shared function support
   // deoptimization.
   inline bool has_deoptimization_support();
 
   // Enable deoptimization support through recompiled code.
   void EnableDeoptimizationSupport(Code* recompiled);
 
@@ skipping 253 matching lines @@
     kIsGenerator,
     kIsConciseMethod,
     kIsAccessorFunction,
     kIsDefaultConstructor,
     kIsSubclassConstructor,
     kIsBaseConstructor,
     kInClassLiteral,
     kIsAsmFunction,
     kDeserialized,
     kNeverCompiled,
+    kAcceptIn,
     kCompilerHintsCount  // Pseudo entry
   };
   // Add hints for other modes when they're added.
   STATIC_ASSERT(LANGUAGE_END == 3);
 
   class FunctionKindBits : public BitField<FunctionKind, kIsArrow, 8> {};
 
   class DeoptCountBits : public BitField<int, 0, 4> {};
   class OptReenableTriesBits : public BitField<int, 4, 18> {};
   class ICAgeBits : public BitField<int, 22, 8> {};
@@ skipping 3729 matching lines @@
   Handle<FixedArray> keys_;
   Handle<OrderedHashSet> set_;
   int length_;
   DISALLOW_COPY_AND_ASSIGN(KeyAccumulator);
 };
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_