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

src/x64/macro-assembler-x64.h

Index: src/x64/macro-assembler-x64.h
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index 4b7b70687100ee96991b3d25a2eed1f5f06c0e3a..695e243c18d2c90ddf0c67f5086b07d907b94e1d 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -1541,8 +1541,7 @@ class MacroAssembler: public Assembler {
 
   // Expects object in rax and returns map with validated enum cache
   // in rax.  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