Do not rely on uniquiness of pthread_t

src/v8.cc

Index: src/v8.cc
diff --git a/src/v8.cc b/src/v8.cc
index f89ed838ce1839b07175bad884427e99ce933c6b..eda8d9614fc9a06ba8570071559d98bc143f21b6 100644
--- a/src/v8.cc
+++ b/src/v8.cc
@@ -63,8 +63,8 @@ bool V8::Initialize(Deserializer* des) {
   }
 
   ASSERT(i::Isolate::CurrentPerIsolateThreadData() != NULL);
-  ASSERT(i::Isolate::CurrentPerIsolateThreadData()->thread_id() ==
-         i::Thread::GetThreadLocalInt(i::Isolate::thread_id_key()));
+  ASSERT(i::Isolate::CurrentPerIsolateThreadData()->thread_id().Equals(
+           i::ThreadId::Current()));
   ASSERT(i::Isolate::CurrentPerIsolateThreadData()->isolate() ==
          i::Isolate::Current());