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Merge #14031: Make IS_TRIVIALLY_CONSTRUCTIBLE consistent on GCC < 5, …
…don't patch clang f1640d0 Make IS_TRIVIALLY_CONSTRUCTIBLE consistent on GCC < 5 (Ben Woosley) Pull request description: `std::is_trivially_constructible<T>` is equivalent to `std::is_trivially_default_constructible<T>` `std::has_trivial_default_constructor<T>` is the GCC < 5 name for `std::is_trivially_default_constructible<T>` https://en.cppreference.com/w/cpp/types/is_default_constructible https://www.gnu.org/software/gcc/gcc-5/changes.html `std::is_trivial` was also used when compiling with clang, due to clang's use of `__GNUC__`. Test `__clang__` to target the intended implementations. https://stackoverflow.com/a/28166605 All callers currently only pass one template argument to IS_TRIVIALLY_CONSTRUCTIBLE, with this change the build would fail if someone attempted passing more. Tree-SHA512: 3e36ddf20a1c0d76ad94d7c95f3fe5b90f4ee00389d5516b35c657136205e7a3ddff60789b0b0b2375624631f15a51eaad3570ef19a7b9df1469a50ba28415d1
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