[PATCH] D54966: Implement P1007R3 `std::assume_aligned`

[Marshall Clow via Phabricator]

mclow.lists created this revision.
mclow.lists added reviewers: lebedev.ri, EricWF, ldionne.

https://wg21.link/P1007R3

This is a first cut.

- The constexpr stuff is not tested; I don't think it's going to work. Still investigating.
- Only GCC and clang are supported at the moment. I need to add other compilers.


https://reviews.llvm.org/D54966

Files:
  include/__config
  include/memory
  test/std/utilities/memory/ptr.align/assume_aligned.fail.cpp
  test/std/utilities/memory/ptr.align/assume_aligned.pass.cpp

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