Fix MSVC warning about missing operator delete.

src/list.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 56 matching lines @@
   }
 
   INLINE(void* operator new(size_t size,
                             AllocationPolicy allocator = AllocationPolicy())) {
     return allocator.New(static_cast<int>(size));
   }
   INLINE(void operator delete(void* p)) {
     AllocationPolicy::Delete(p);
   }
 
+  // Please the MSVC compiler.  We should never have to execute this.
+  INLINE(void operator delete(void* p, AllocationPolicy allocator)) {
+    UNREACHABLE();
+  }
+
   // Returns a reference to the element at index i.  This reference is
   // not safe to use after operations that can change the list's
   // backing store (e.g. Add).
   inline T& operator[](int i) const {
     ASSERT(0 <= i);
     ASSERT(i < length_);
     return data_[i];
   }
   inline T& at(int i) const { return operator[](i); }
   inline T& last() const { return at(length_ - 1); }
@@ skipping 114 matching lines @@
 template <typename T, class P>
 int SortedListBSearch(const List<T>& list, P cmp);
 template <typename T>
 int SortedListBSearch(const List<T>& list, T elem);
 
 
 } }  // namespace v8::internal
 
 
 #endif  // V8_LIST_H_