[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 232295965f3d10f181c52b999947172f3567d3a9..ca61ee22188f9ae21db4e77d274976d1f98c7910 100644
--- a/test/cctest/compiler/test-run-intrinsics.cc
+++ b/test/cctest/compiler/test-run-intrinsics.cc
@@ -128,18 +128,6 @@ TEST(IsMinusZero) {
 }
 
 
-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());
-}
-
-
 TEST(IsRegExp) {
   FunctionTester T("(function(a) { return %_IsRegExp(a); })", flags);