[Interpereter] Inline FastNewClosure into CreateClosure bytecode handler

src/interpreter/bytecodes.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_BYTECODES_H_
 #define V8_INTERPRETER_BYTECODES_H_
 
 #include <iosfwd>
 
 // Clients of this interface shouldn't depend on lots of interpreter internals.
@@ skipping 643 matching lines @@
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(Bytecodes);
 };
 
 class CreateObjectLiteralFlags {
  public:
   class FlagsBits : public BitField8<int, 0, 3> {};
   class FastClonePropertiesCountBits
       : public BitField8<int, FlagsBits::kNext, 3> {};
-  STATIC_ASSERT((FlagsBits::kMask & FastClonePropertiesCountBits::kMask) == 0);
+
+  static uint8_t Encode(bool fast_clone_supported, int properties_count,
+                        int runtime_flags);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(CreateObjectLiteralFlags);
+};
+
+class CreateClosureFlags {
+ public:
+  class PretenuredBit : public BitField8<bool, 0, 1> {};
+  class FastNewClosureBit : public BitField8<bool, PretenuredBit::kNext, 1> {};
+
+  static uint8_t Encode(bool pretenure, bool is_function_scope);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(CreateClosureFlags);
 };
 
 std::ostream& operator<<(std::ostream& os, const Bytecode& bytecode);
 std::ostream& operator<<(std::ostream& os, const AccumulatorUse& use);
 std::ostream& operator<<(std::ostream& os, const OperandScale& operand_scale);
 std::ostream& operator<<(std::ostream& os, const OperandSize& operand_size);
 std::ostream& operator<<(std::ostream& os, const OperandType& operand_type);
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODES_H_