Revert of [runtime] Remove useless IN builtin.

test/cctest/compiler/test-run-intrinsics.cc

Index: test/cctest/compiler/test-run-intrinsics.cc
diff --git a/test/cctest/compiler/test-run-intrinsics.cc b/test/cctest/compiler/test-run-intrinsics.cc
index ce449075c0634dd0cafacbd59a1415d1ab529fe3..1fa37748c6753d5e0b64705bc5cb0100088d0d1e 100644
--- a/test/cctest/compiler/test-run-intrinsics.cc
+++ b/test/cctest/compiler/test-run-intrinsics.cc
@@ -122,6 +122,18 @@
   T.CheckFalse(T.Val(1));
   T.CheckFalse(T.Val(1.1));
   T.CheckTrue(T.Val(-0.0));
+  T.CheckFalse(T.Val(-2));
+  T.CheckFalse(T.Val(-2.3));
+  T.CheckFalse(T.undefined());
+}
+
+
+TEST(IsNonNegativeSmi) {
+  FunctionTester T("(function(a) { return %_IsNonNegativeSmi(a); })", flags);
+
+  T.CheckTrue(T.Val(1));
+  T.CheckFalse(T.Val(1.1));
+  T.CheckFalse(T.Val(-0.0));
   T.CheckFalse(T.Val(-2));
   T.CheckFalse(T.Val(-2.3));
   T.CheckFalse(T.undefined());