fix PerformCastCheck on v8::Data

PerformCheckCast<Data>() itself should not invoke Data::Cast(), since
there is no such method and every publicly available value can be
casted to it anyway. This is an issue in e.g.
GetDataFromSnapshotOnce<Data>().

Change-Id: I5d9ee89657c31bc0ca1fb16e704df58911c85f6c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2383030
Commit-Queue: Gus Caplan <snek@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69622}

include/v8-internal.h

@@ -414,7 +414,8 @@ void CastCheck<false>::Perform(T* data) {}
 
 template <class T>
 V8_INLINE void PerformCastCheck(T* data) {
-  CastCheck<std::is_base_of<Data, T>::value>::Perform(data);
+  CastCheck<std::is_base_of<Data, T>::value &&
+            !std::is_same<Data, std::remove_cv<T>>::value>::Perform(data);
 }
 
 // A base class for backing stores, which is needed due to vagaries of