Use macros instead of using number directly for x64

src/x64/macro-assembler-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 4172 matching lines @@
   }
 
   ASSERT(source.is(rsi));
   ASSERT(destination.is(rdi));
   ASSERT(length.is(rcx));
 
   // Because source is 8-byte aligned in our uses of this function,
   // we keep source aligned for the rep movs operation by copying the odd bytes
   // at the end of the ranges.
   movq(scratch, length);
-  shrl(length, Immediate(3));
+  shrl(length, Immediate(kPointerSizeLog2));
   repmovsq();
   // Move remaining bytes of length.
-  andl(scratch, Immediate(0x7));
-  movq(length, Operand(source, scratch, times_1, -8));
-  movq(Operand(destination, scratch, times_1, -8), length);
+  andl(scratch, Immediate(kPointerSize - 1));
+  movq(length, Operand(source, scratch, times_1, -kPointerSize));
+  movq(Operand(destination, scratch, times_1, -kPointerSize), length);
   addq(destination, scratch);
 
   if (min_length <= kLongStringLimit) {
     jmp(&done);
 
     bind(&short_string);
     if (min_length == 0) {
       testl(length, length);
       j(zero, &done);
     }
@@ skipping 492 matching lines @@
   j(greater, &no_info_available);
   CompareRoot(MemOperand(scratch_reg, -AllocationSiteInfo::kSize),
               Heap::kAllocationSiteInfoMapRootIndex);
   bind(&no_info_available);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64