[for-in] Sanitize for-in optimizations and fix bailout points.

src/mips/macro-assembler-mips.h

Index: src/mips/macro-assembler-mips.h
diff --git a/src/mips/macro-assembler-mips.h b/src/mips/macro-assembler-mips.h
index 826328f4e0df694e02c090a4aed09471bc7e3af3..5cfbb3143ae3a684f6f8e6005067748bce9b7808 100644
--- a/src/mips/macro-assembler-mips.h
+++ b/src/mips/macro-assembler-mips.h
@@ -1595,7 +1595,7 @@ const Operand& rt = Operand(zero_reg), BranchDelaySlot bd = PROTECT
 
   // Expects object in a0 and returns map with validated enum cache
   // in a0.  Assumes that any other register can be used as a scratch.
-  void CheckEnumCache(Register null_value, Label* call_runtime);
+  void CheckEnumCache(Label* call_runtime);
 
   // AllocationMemento support. Arrays may have an associated
   // AllocationMemento object that can be checked for in order to pretransition