Levi Tamasi 810ab34ede Do not rely on the two-argument std::pair constructor being constexpr (#7519)
Summary:
The `std::pair(const T1& x, const T2& y);` constructor is `constexpr`
only starting from C++14; relying on this breaks compilation on certain
compilers/platforms we need to support.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7519

Test Plan: `make check`

Reviewed By: ajkr

Differential Revision: D24195747

Pulled By: ltamasi

fbshipit-source-id: 665e8fbc9747675bb49c5d895aad3dcf2714750f
2020-10-08 10:49:40 -07:00
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