Mark de Wever ecabb39ca1 Revert "[libc++] P1645 constexpr for <numeric>"
This reverts commit eb9b063539c34d0d4dd14e8516eeb77bb8b9e4bd.

The commit fails to build on build bots using LLVM 8.
2020-11-25 13:46:08 +01:00
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