Don't add code dependencies eagerly for HCheckMaps.

src/arm64/lithium-arm64.h

Index: src/arm64/lithium-arm64.h
diff --git a/src/arm64/lithium-arm64.h b/src/arm64/lithium-arm64.h
index f5143ff52e81b1aef88a954db348a177ca83fa89..7c5ebcd14d272cf0659c0e1a78f6373098602532 100644
--- a/src/arm64/lithium-arm64.h
+++ b/src/arm64/lithium-arm64.h
@@ -908,7 +908,7 @@ class LCheckInstanceType V8_FINAL : public LTemplateInstruction<0, 1, 1> {
 
 class LCheckMaps V8_FINAL : public LTemplateInstruction<0, 1, 1> {
  public:
-  explicit LCheckMaps(LOperand* value, LOperand* temp) {
+  LCheckMaps(LOperand* value = NULL, LOperand* temp = NULL) {
     inputs_[0] = value;
     temps_[0] = temp;
   }