Fix x64 MathMinMax for negative untagged int32 arguments.

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index 2a10a87ac71e3868e344c9cc2a004cf0ef89a372..477edd88e8d7798340aa752a5a90565511f9a353 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -1631,17 +1631,17 @@ void LCodeGen::DoMathMinMax(LMathMinMax* instr) {
     if (right->IsConstantOperand()) {
       Immediate right_imm =
           Immediate(ToInteger32(LConstantOperand::cast(right)));
-      __ cmpq(left_reg, right_imm);
+      __ cmpl(left_reg, right_imm);
       __ j(condition, &return_left, Label::kNear);
       __ movq(left_reg, right_imm);
     } else if (right->IsRegister()) {
       Register right_reg = ToRegister(right);
-      __ cmpq(left_reg, right_reg);
+      __ cmpl(left_reg, right_reg);
       __ j(condition, &return_left, Label::kNear);
       __ movq(left_reg, right_reg);
     } else {
       Operand right_op = ToOperand(right);
-      __ cmpq(left_reg, right_op);
+      __ cmpl(left_reg, right_op);
       __ j(condition, &return_left, Label::kNear);
       __ movq(left_reg, right_op);
     }