[runtime] Remove useless IN builtin.

src/compiler/js-intrinsic-lowering.h

Index: src/compiler/js-intrinsic-lowering.h
diff --git a/src/compiler/js-intrinsic-lowering.h b/src/compiler/js-intrinsic-lowering.h
index c14882c7341337ca52e35e49931c79ed87b74171..15e9b4053e7ef388d0b98de37317ce7e39ff3442 100644
--- a/src/compiler/js-intrinsic-lowering.h
+++ b/src/compiler/js-intrinsic-lowering.h
@@ -41,7 +41,6 @@ class JSIntrinsicLowering final : public AdvancedReducer {
   Reduction ReduceIncrementStatsCounter(Node* node);
   Reduction ReduceIsMinusZero(Node* node);
   Reduction ReduceIsInstanceType(Node* node, InstanceType instance_type);
-  Reduction ReduceIsNonNegativeSmi(Node* node);
   Reduction ReduceIsSmi(Node* node);
   Reduction ReduceJSValueGetValue(Node* node);
   Reduction ReduceMapGetInstanceType(Node* node);