Fix bug in CheckBothPositiveSmi macro.

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 0259054e4417e495b8a3e4751a27acd0cac6a6af..32cd2dbc130bfdb4dab1f0856d10d7ff8a0385e9 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -652,8 +652,8 @@ Condition MacroAssembler::CheckBothPositiveSmi(Register first,
   if (first.is(second)) {
     return CheckPositiveSmi(first);
   }
-  movl(kScratchRegister, first);
-  orl(kScratchRegister, second);
+  movq(kScratchRegister, first);
+  or_(kScratchRegister, second);
   rol(kScratchRegister, Immediate(1));
   testl(kScratchRegister, Immediate(0x03));
   return zero;