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Now that __alignof__ and alignof sometimes disagree it matters which one we use. The standard says that std::alignment_of<T>::value equals alignof(T), so we need to use that. Change the only uses of alignment_of to use __alignof__ to avoid a change in alignment. PR libstdc++/88119 * include/ext/aligned_buffer.h (__aligned_membuf): Add comment. (__aligned_buffer): Use __alignof__ instead of std::alignment_of. * include/std/type_traits (alignment_of): Use alignof instead of __alignof__. * testsuite/20_util/alignment_of/value.cc: Fix test to check values match alignof not __alignof__, as required by the standard. Tested powercp64le-linux, committed to trunk. This should be changed on gcc-8-branch too.
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