Fix smi-comparison to use correct macros in X64-SwapElements.

src/x64/codegen-x64.cc

Index: src/x64/codegen-x64.cc
diff --git a/src/x64/codegen-x64.cc b/src/x64/codegen-x64.cc
index 6c8b33398460a8dc11d6c4ef31b96f0946b3ea0d..9a2557229812e3693b6e3ee04d1bfc8ef47418f6 100644
--- a/src/x64/codegen-x64.cc
+++ b/src/x64/codegen-x64.cc
@@ -6784,9 +6784,9 @@ void CodeGenerator::GenerateSwapElements(ZoneList<Expression*>* args) {
 
   // Check that both indices are valid.
   __ movq(tmp2.reg(), FieldOperand(object.reg(), JSArray::kLengthOffset));
-  __ cmpl(tmp2.reg(), index1.reg());
+  __ SmiCompare(tmp2.reg(), index1.reg());
   deferred->Branch(below_equal);
-  __ cmpl(tmp2.reg(), index2.reg());
+  __ SmiCompare(tmp2.reg(), index2.reg());
   deferred->Branch(below_equal);
 
   // Bring addresses into index1 and index2.