Correct r17804 to match latest version of uploaded CL

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 3888 matching lines @@
   int token_offset =
       Context::kHeaderSize + Context::SECURITY_TOKEN_INDEX * kPointerSize;
   movq(scratch, FieldOperand(scratch, token_offset));
   cmpq(scratch, FieldOperand(kScratchRegister, token_offset));
   j(not_equal, miss);
 
   bind(&same_contexts);
 }
 
 
+// Compute the hash code from the untagged key.  This must be kept in sync with
+// ComputeIntegerHash in utils.h and KeyedLoadGenericElementStub in
+// code-stub-hydrogen.cc
 void MacroAssembler::GetNumberHash(Register r0, Register scratch) {
   // First of all we assign the hash seed to scratch.
   LoadRoot(scratch, Heap::kHashSeedRootIndex);
   SmiToInteger32(scratch, scratch);
 
   // Xor original key with a seed.
   xorl(r0, scratch);
 
   // Compute the hash code from the untagged key.  This must be kept in sync
   // with ComputeIntegerHash in utils.h.
@@ skipping 1063 matching lines @@
   j(equal, found);
   movq(current, FieldOperand(current, Map::kPrototypeOffset));
   CompareRoot(current, Heap::kNullValueRootIndex);
   j(not_equal, &loop_again);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64