[runtime] Remove useless IN builtin.

src/compiler/js-intrinsic-lowering.cc

Index: src/compiler/js-intrinsic-lowering.cc
diff --git a/src/compiler/js-intrinsic-lowering.cc b/src/compiler/js-intrinsic-lowering.cc
index e82ac205ccf46d72b20022fd05f170db5445784c..4917953264fab7994f21728a30c9647efa96c740 100644
--- a/src/compiler/js-intrinsic-lowering.cc
+++ b/src/compiler/js-intrinsic-lowering.cc
@@ -52,8 +52,6 @@ Reduction JSIntrinsicLowering::Reduce(Node* node) {
       return ReduceIsInstanceType(node, JS_TYPED_ARRAY_TYPE);
     case Runtime::kInlineIsFunction:
       return ReduceIsInstanceType(node, JS_FUNCTION_TYPE);
-    case Runtime::kInlineIsNonNegativeSmi:
-      return ReduceIsNonNegativeSmi(node);
     case Runtime::kInlineIsRegExp:
       return ReduceIsInstanceType(node, JS_REGEXP_TYPE);
     case Runtime::kInlineIsSmi:
@@ -239,11 +237,6 @@ Reduction JSIntrinsicLowering::ReduceIsInstanceType(
 }
 
 
-Reduction JSIntrinsicLowering::ReduceIsNonNegativeSmi(Node* node) {
-  return Change(node, simplified()->ObjectIsNonNegativeSmi());
-}
-
-
 Reduction JSIntrinsicLowering::ReduceIsSmi(Node* node) {
   return Change(node, simplified()->ObjectIsSmi());
 }