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These swap tests were swapping non-POCS non-equal allocators which is undefined behavior. This patch changes the tests to use allocators which compare equal. In order to test that the allocators were not swapped I added an "id" field to test_allocator which does not participate in equality but does propagate across copies/swaps. This patch is based off of D26623 which was submitted by STL. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@289358 91177308-0d34-0410-b5e6-96231b3b80d8