Allow IdentityMap to store Smi-0.

test/cctest/test-identity-map.cc

Index: test/cctest/test-identity-map.cc
diff --git a/test/cctest/test-identity-map.cc b/test/cctest/test-identity-map.cc
index 8523f25336bbfb1a4c23f88319350bffaf2e9615..6254bbfc6c988a623fe2633a72934feddf5d8c72 100644
--- a/test/cctest/test-identity-map.cc
+++ b/test/cctest/test-identity-map.cc
@@ -178,7 +178,7 @@ TEST(GetFind_num_1000) {
   int val1;
   int val2;
 
-  for (int i = 1; i < 1000; i++) {
+  for (int i = 0; i < 1000; i++) {
     t.TestGetFind(t.smi(i * kPrime), &val1, t.smi(i * kPrime + 1), &val2);
   }
 }