Remove ~MaybeHandle and statically assert that handles are trivially copyable

src/handles.h

 // Copyright 2011 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_HANDLES_H_
 #define V8_HANDLES_H_
 
 #include <type_traits>
 
 #include "include/v8.h"
@@ skipping 167 matching lines @@
 // into a Handle requires checking that it does not point to NULL.  This
 // ensures NULL checks before use.
 //
 // Also note that Handles do not provide default equality comparison or hashing
 // operators on purpose. Such operators would be misleading, because intended
 // semantics is ambiguous between Handle location and object identity.
 template <typename T>
 class MaybeHandle final {
  public:
   V8_INLINE MaybeHandle() {}
-  V8_INLINE ~MaybeHandle() {}
 
   // Constructor for handling automatic up casting from Handle.
   // Ex. Handle<JSArray> can be passed when MaybeHandle<Object> is expected.
   template <typename S>
   V8_INLINE MaybeHandle(Handle<S> handle)
       : location_(reinterpret_cast<T**>(handle.location_)) {
     T* a = nullptr;
     S* b = nullptr;
     a = b;  // Fake assignment to enforce type checks.
     USE(a);
@@ skipping 215 matching lines @@
     next = limit = NULL;
     sealed_level = level = 0;
     canonical_scope = NULL;
   }
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HANDLES_H_