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In r361572, we introduced library support for C++20 destroying delete and decided to only define the library feature-test macro when the compiler supports the underlying language feature. This patch reworks the tests to mirror that. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@366263 91177308-0d34-0410-b5e6-96231b3b80d8