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Fixed the inability to properly rebind the testing allocator, by making the inner alloc_impl type a plain struct and making the operations templates. Before rebind failed to compile complaining that a alloc_impl<T>* was not convertible to an alloc_impl<U>*. This enables the test to pass for MSVC++ once we provide the strong guarantee for the copy assignment operator. Reviewed as https://reviews.llvm.org/D60023 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@357545 91177308-0d34-0410-b5e6-96231b3b80d8