Don't add code dependencies eagerly for HCheckMaps.

src/mips/lithium-mips.h

Index: src/mips/lithium-mips.h
diff --git a/src/mips/lithium-mips.h b/src/mips/lithium-mips.h
index 3c6c9f69709e573f232b8d4fcef9b33683c46e23..14ac0a48232468a8a0ddf1f0779ee15573af1533 100644
--- a/src/mips/lithium-mips.h
+++ b/src/mips/lithium-mips.h
@@ -2330,7 +2330,7 @@ class LCheckInstanceType V8_FINAL : public LTemplateInstruction<0, 1, 0> {
 
 class LCheckMaps V8_FINAL : public LTemplateInstruction<0, 1, 0> {
  public:
-  explicit LCheckMaps(LOperand* value) {
+  explicit LCheckMaps(LOperand* value = NULL) {
     inputs_[0] = value;
   }