Introduce LoadSharedFunctionInfoSpecialField for x64 port.

src/x64/macro-assembler-x64.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 795 matching lines @@
 
   // cvtsi2sd instruction only writes to the low 64-bit of dst register, which
   // hinders register renaming and makes dependence chains longer. So we use
   // xorps to clear the dst register before cvtsi2sd to solve this issue.
   void Cvtlsi2sd(XMMRegister dst, Register src);
   void Cvtlsi2sd(XMMRegister dst, const Operand& src);
 
   // Move if the registers are not identical.
   void Move(Register target, Register source);
 
-  // Bit-field support.
-  void TestBit(const Operand& dst, int bit_index);
+  // TestBit and Load SharedFunctionInfo special field.
+  void TestBitSharedFunctionInfoSpecialField(Register base,
+                                             int offset,
+                                             int bit_index);
+  void LoadSharedFunctionInfoSpecialField(Register dst,
+                                          Register base,
+                                          int offset);
 
   // Handle support
   void Move(Register dst, Handle<Object> source);
   void Move(const Operand& dst, Handle<Object> source);
   void Cmp(Register dst, Handle<Object> source);
   void Cmp(const Operand& dst, Handle<Object> source);
   void Cmp(Register dst, Smi* src);
   void Cmp(const Operand& dst, Smi* src);
   void Push(Handle<Object> source);
 
@@ skipping 791 matching lines @@
     masm->popfq();                                                           \
   }                                                                          \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_MACRO_ASSEMBLER_X64_H_