[runtime] Remove useless IN builtin.

test/unittests/compiler/simplified-operator-unittest.cc

Index: test/unittests/compiler/simplified-operator-unittest.cc
diff --git a/test/unittests/compiler/simplified-operator-unittest.cc b/test/unittests/compiler/simplified-operator-unittest.cc
index 07728913b1807cd8b60e75d6d3e33fa626e9ed6b..f4c74a535fb2ed55015aad5bdd35f98638e3a78c 100644
--- a/test/unittests/compiler/simplified-operator-unittest.cc
+++ b/test/unittests/compiler/simplified-operator-unittest.cc
@@ -62,8 +62,7 @@ const PureOperator kPureOperators[] = {
     PURE(ChangeFloat64ToTagged, Operator::kNoProperties, 1),
     PURE(ChangeBoolToBit, Operator::kNoProperties, 1),
     PURE(ChangeBitToBool, Operator::kNoProperties, 1),
-    PURE(ObjectIsSmi, Operator::kNoProperties, 1),
-    PURE(ObjectIsNonNegativeSmi, Operator::kNoProperties, 1)
+    PURE(ObjectIsSmi, Operator::kNoProperties, 1)
 #undef PURE
 };