Fixed lint errors caused by "runtime/references" rule and the rule itself is restored.

src/mips/lithium-codegen-mips.h

Index: src/mips/lithium-codegen-mips.h
diff --git a/src/mips/lithium-codegen-mips.h b/src/mips/lithium-codegen-mips.h
index 3e661045f0df5440e232d8ab8b581242beb0155f..d70c871265c734982743aa76699ba62f28fea6b7 100644
--- a/src/mips/lithium-codegen-mips.h
+++ b/src/mips/lithium-codegen-mips.h
@@ -316,8 +316,8 @@ class LCodeGen: public LCodeGenBase {
                          Label* false_label,
                          Register input,
                          Handle<String> type_name,
-                         Register& cmp1,
-                         Operand& cmp2);
+                         Register* cmp1,
+                         Operand* cmp2);
 
   // Emits optimized code for %_IsObject(x).  Preserves input register.
   // Returns the condition on which a final split to