Port faster callbacks invocation to x64.

src/x64/assembler-x64.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 491 matching lines @@
   // Aligns code to something that's optimal for a jump target for the platform.
   void CodeTargetAlign();
 
   // Stack
   void pushfq();
   void popfq();
 
   void push(Immediate value);
   void push(Register src);
   void push(const Operand& src);
-  void push(Label* label, RelocInfo::Mode relocation_mode);
 
   void pop(Register dst);
   void pop(const Operand& dst);
 
   void enter(Immediate size);
   void leave();
 
   // Moves
   void movb(Register dst, const Operand& src);
   void movb(Register dst, Immediate imm);
@@ skipping 906 matching lines @@
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_ASSEMBLER_X64_H_