Correct r17804 to match latest version of uploaded CL

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index 99562f0cf3f414280e2a79cd4057cc475d0c31e0..fd857d317605316e70425a642c2ab006171e0dfe 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -3906,6 +3906,9 @@ void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg,
 }
 
 
+// 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);