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

src/mips64/macro-assembler-mips64.h

Index: src/mips64/macro-assembler-mips64.h
diff --git a/src/mips64/macro-assembler-mips64.h b/src/mips64/macro-assembler-mips64.h
index bc2eaa95b54ddccb355e93f79c67da1f948356ab..117d25e7de8c2fbd827ec4b8409cb4a137fc2825 100644
--- a/src/mips64/macro-assembler-mips64.h
+++ b/src/mips64/macro-assembler-mips64.h
@@ -1744,7 +1744,7 @@ 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