[runtime] Remove useless IN builtin.

src/compiler/simplified-lowering.cc

Index: src/compiler/simplified-lowering.cc
diff --git a/src/compiler/simplified-lowering.cc b/src/compiler/simplified-lowering.cc
index bf7daad797a92b545d0054029dad504dc879f39b..0d4593f7c914968c83b0cf650d6d2a222f3fa8a2 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -919,25 +919,6 @@ class RepresentationSelector {
         }
         break;
       }
-      case IrOpcode::kObjectIsNonNegativeSmi: {
-        ProcessInput(node, 0, kMachAnyTagged);
-        SetOutput(node, kRepBit | kTypeBool);
-        if (lower()) {
-          Node* is_tagged = jsgraph_->graph()->NewNode(
-              jsgraph_->machine()->WordAnd(), node->InputAt(0),
-              jsgraph_->IntPtrConstant(kSmiTagMask));
-          Node* is_smi = jsgraph_->graph()->NewNode(
-              jsgraph_->machine()->WordEqual(), is_tagged,
-              jsgraph_->IntPtrConstant(kSmiTag));
-          Node* is_non_neg = jsgraph_->graph()->NewNode(
-              jsgraph_->machine()->IntLessThanOrEqual(),
-              jsgraph_->IntPtrConstant(0), node->InputAt(0));
-          Node* is_non_neg_smi = jsgraph_->graph()->NewNode(
-              jsgraph_->machine()->Word32And(), is_smi, is_non_neg);
-          DeferReplacement(node, is_non_neg_smi);
-        }
-        break;
-      }
 
       //------------------------------------------------------------------
       // Machine-level operators.