Use a better hash function in IdentityMap.

test/unittests/interpreter/constant-array-builder-unittest.cc

Index: test/unittests/interpreter/constant-array-builder-unittest.cc
diff --git a/test/unittests/interpreter/constant-array-builder-unittest.cc b/test/unittests/interpreter/constant-array-builder-unittest.cc
index b32b1af55c3d3dfcd6f005dc177639190863d7ee..b3ec5ff6680113e19e076493145daabdf1af3066 100644
--- a/test/unittests/interpreter/constant-array-builder-unittest.cc
+++ b/test/unittests/interpreter/constant-array-builder-unittest.cc
@@ -33,13 +33,11 @@ STATIC_CONST_MEMBER_DEFINITION const size_t
 TEST_F(ConstantArrayBuilderTest, AllocateAllEntries) {
   ConstantArrayBuilder builder(isolate(), zone());
   for (size_t i = 0; i < kMaxCapacity; i++) {
-    Handle<Object> object = isolate()->factory()->NewNumberFromSize(i);
-    builder.Insert(object);
-    CHECK_EQ(builder.size(), i + 1);
-    CHECK(builder.At(i)->SameValue(*object));
+    builder.Insert(handle(Smi::FromInt(static_cast<int>(i)), isolate()));
   }
+  CHECK_EQ(builder.size(), kMaxCapacity);
   for (size_t i = 0; i < kMaxCapacity; i++) {
-    CHECK_EQ(Handle<Smi>::cast(builder.At(i))->value(), static_cast<double>(i));
+    CHECK_EQ(Handle<Smi>::cast(builder.At(i))->value(), i);
   }
 }