X64: Fix incompatability with previous revision.

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 9c314aa59bdb06420acbcb0250d0a09cf8c267c8..3768244e4d570f9c9fe69cb7c472d3f26c366581 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -701,7 +701,7 @@ void MacroAssembler::SmiTryAddConstant(Register dst,
                                        Smi* constant,
                                        Label* on_not_smi_result) {
   // Does not assume that src is a smi.
-  ASSERT_EQ(1, kSmiTagMask);
+  ASSERT_EQ(static_cast<intptr_t>(1), kSmiTagMask);
   ASSERT_EQ(0, kSmiTag);
   ASSERT(!dst.is(kScratchRegister));
   ASSERT(!src.is(kScratchRegister));