Add Smi::Zero and replace all Smi::FromInt(0) calls

src/api.h

 // Copyright 2012 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.
 
 #ifndef V8_API_H_
 #define V8_API_H_
 
 #include "include/v8-testing.h"
 #include "src/contexts.h"
 #include "src/factory.h"
@@ skipping 10 matching lines @@
 class Consts {
  public:
   enum TemplateType {
     FUNCTION_TEMPLATE = 0,
     OBJECT_TEMPLATE = 1
   };
 };
 
 template <typename T> inline T ToCData(v8::internal::Object* obj) {
   STATIC_ASSERT(sizeof(T) == sizeof(v8::internal::Address));
-  if (obj == v8::internal::Smi::FromInt(0)) return nullptr;
+  if (obj == v8::internal::Smi::kZero) return nullptr;
   return reinterpret_cast<T>(
       reinterpret_cast<intptr_t>(
           v8::internal::Foreign::cast(obj)->foreign_address()));
 }
 
 
 template <typename T>
 inline v8::internal::Handle<v8::internal::Object> FromCData(
     v8::internal::Isolate* isolate, T obj) {
   STATIC_ASSERT(sizeof(T) == sizeof(v8::internal::Address));
-  if (obj == nullptr) return handle(v8::internal::Smi::FromInt(0), isolate);
+  if (obj == nullptr) return handle(v8::internal::Smi::kZero, isolate);
   return isolate->factory()->NewForeign(
       reinterpret_cast<v8::internal::Address>(reinterpret_cast<intptr_t>(obj)));
 }
 
 
 class ApiFunction {
  public:
   explicit ApiFunction(v8::internal::Address addr) : addr_(addr) { }
   v8::internal::Address address() { return addr_; }
  private:
@@ skipping 609 matching lines @@
   }
 
  private:
   static v8::Testing::StressType stress_type_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_API_H_