remove equality kind from compare nil ic

src/ic.cc

Index: src/ic.cc
diff --git a/src/ic.cc b/src/ic.cc
index ef8ab8a309eb3a4e5bb067f3cf2419b3629f05c4..d5e5c9f21d7ba0a8db9d7a4216eb3b680d49649f 100644
--- a/src/ic.cc
+++ b/src/ic.cc
@@ -2939,16 +2939,8 @@ void CompareNilIC::Clear(Address address, Code* target) {
 }
 
 
-MaybeObject* CompareNilIC::DoCompareNilSlow(EqualityKind kind,
-                                            NilValue nil,
+MaybeObject* CompareNilIC::DoCompareNilSlow(NilValue nil,
                                             Handle<Object> object) {
-  if (kind == kStrictEquality) {
-    if (nil == kNullValue) {
-      return Smi::FromInt(object->IsNull());
-    } else {
-      return Smi::FromInt(object->IsUndefined());
-    }
-  }
   if (object->IsNull() || object->IsUndefined()) {
     return Smi::FromInt(true);
   }
@@ -2969,7 +2961,6 @@ MaybeObject* CompareNilIC::CompareNil(Handle<Object> object) {
   stub.Record(object);
   old_types.TraceTransition(stub.GetTypes());
 
-  EqualityKind kind = stub.GetKind();
   NilValue nil = stub.GetNilValue();
 
   // Find or create the specialized stub to support the new set of types.
@@ -2983,7 +2974,7 @@ MaybeObject* CompareNilIC::CompareNil(Handle<Object> object) {
     code = stub.GetCode(isolate());
   }
   set_target(*code);
-  return DoCompareNilSlow(kind, nil, object);
+  return DoCompareNilSlow(nil, object);
 }