Enable preaging of code objects when --optimize-for-size.

src/x64/codegen-x64.cc

 // 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 660 matching lines @@
   __ subsd(result, double_scratch);
   __ addsd(result, Operand(kScratchRegister, 8 * kDoubleSize));
   __ mulsd(result, input);
 
   __ bind(&done);
 }
 
 #undef __
 
 
-static const int kNoCodeAgeSequenceLength = 6;
-
 static byte* GetNoCodeAgeSequence(uint32_t* length) {
   static bool initialized = false;
   static byte sequence[kNoCodeAgeSequenceLength];
   *length = kNoCodeAgeSequenceLength;
   if (!initialized) {
     // The sequence of instructions that is patched out for aging code is the
     // following boilerplate stack-building prologue that is found both in
     // FUNCTION and OPTIMIZED_FUNCTION code:
     CodePatcher patcher(sequence, kNoCodeAgeSequenceLength);
     patcher.masm()->push(rbp);
@@ skipping 70 matching lines @@
     // argument_count_reg_ * times_pointer_size + (receiver - 1) * kPointerSize.
     return Operand(base_reg_, argument_count_reg_, times_pointer_size,
         displacement_to_last_argument + (receiver - 1 - index) * kPointerSize);
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64