Allow IdentityMap to store Smi-0.

test/cctest/test-identity-map.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/identity-map.h"
 #include "src/zone.h"
 
 #include "test/cctest/cctest.h"
@@ skipping 160 matching lines @@
   }
 }
 
 
 TEST(GetFind_num_1000) {
   const int kPrime = 137;
   IdentityMapTester t;
   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);
   }
 }
 
 
 TEST(GetFind_smi_gc) {
   const int kKey = 33;
   const int kShift = 1211;
   IdentityMapTester t;
 
@@ skipping 139 matching lines @@
 
   // Check that searching for the numbers finds the same values.
   for (size_t i = 0; i < arraysize(num_keys); i++) {
     t.CheckFind(num_keys[i], &num_keys[i]);
     t.CheckGet(num_keys[i], &num_keys[i]);
   }
 }
 
 }  // namespace internal
 }  // namespace v8