[libcxx] [test] Fix test bugs in string.cons/copy_alloc.pass.cpp.
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 llvm-svn: 357545
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