ARM64: Fix some signed-unsigned comparisons from cdc43bc (r28412).

src/arm64/instructions-arm64.cc

Index: src/arm64/instructions-arm64.cc
diff --git a/src/arm64/instructions-arm64.cc b/src/arm64/instructions-arm64.cc
index 814ead318c749960cebcd3ace5767f36cfa87bb1..fce7a67ba508c41265eae107d6a18519e84a5530 100644
--- a/src/arm64/instructions-arm64.cc
+++ b/src/arm64/instructions-arm64.cc
@@ -319,7 +319,7 @@ void Instruction::SetImmLLiteral(Instruction* source) {
 bool InstructionSequence::IsInlineData() const {
   // Inline data is encoded as a single movz instruction which writes to xzr
   // (x31).
-  return IsMovz() && SixtyFourBits() && (Rd() == xzr.code());
+  return IsMovz() && SixtyFourBits() && (Rd() == kZeroRegCode);
   // TODO(all): If we extend ::InlineData() to support bigger data, we need
   // to update this method too.
 }