[libc++][type_traits] P2674R1: A trait for implicit lifetime types (#106870) Implements P2674R1: https://wg21.link/P2674R1 - https://eel.is/c++draft/type.traits - https://eel.is/c++draft/meta.type.synop - https://eel.is/c++draft/meta.unary.prop - https://eel.is/c++draft/support.limits - https://eel.is/c++draft/version.syn Implementation details: - Uses compiler intrinsic `__builtin_is_implicit_lifetime`: - https://github.com/llvm/llvm-project/pull/101807 - Tests based on: - https://github.com/llvm/llvm-project/blob/d213981c80626698a07b11ce872acba098a863d4/clang/test/SemaCXX/type-traits.cpp#L1989 References: - Implicit-lifetime - Implicit-lifetime types [basic.types.general]/9: https://eel.is/c++draft/basic.types.general - Implicit-lifetime class [class.prop]/9: https://eel.is/c++draft/class.prop - P0593R6 Implicit creation of objects for low-level object manipulation: https://wg21.link/P0593R6 - P1010R1 Container support for implicit lifetime types: https://wg21.link/P1010R1 - P0593R6 Implicit creation of objects for low-level object manipulation: https://wg21.link/P0593R6 Closes: #105259 --------- Co-authored-by: Hristo Hristov <zingam@outlook.com>
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