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 db1cb956edc75f64fdf6249ef0c25fe1e8f20bdc..94e8773a165fbc6ae9d9a967ac0b93cb785dbf3d 100644
--- a/src/ic.cc
+++ b/src/ic.cc
@@ -2943,16 +2943,8 @@ 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);
   }
@@ -2973,7 +2965,6 @@ 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.
@@ -2987,7 +2978,7 @@ MaybeObject* CompareNilIC::CompareNil(Handle<Object> object) {
     code = stub.GetCode(isolate());
   }
   set_target(*code);
-  return DoCompareNilSlow(kind, nil, object);
+  return DoCompareNilSlow(nil, object);
 }