tree f7bfbcbd2712a7b5d9c165f86be4b9fe3961947f
parent 250205c9d2597407c61794f070b44690616b5180
author Richard Smith <richard-llvm@metafoo.co.uk> 1556152501 +0000
committer Richard Smith <richard-llvm@metafoo.co.uk> 1556152501 +0000

Use modern type trait implementations when available.

Teach libcxx to stop using various deprecated __has_* type traits, in favor of
the ("modern", C++11 era) __is_* type traits.

This is mostly just a simplification, but fixes at least one bug: _Atomic T
should be considered trivially-destructible, but is not considered to be POD by
Clang, and __has_trivial_destructor is specified in the GCC documentation as
returning false for non-POD non-class types.

Differential Revision: https://reviews.llvm.org/D48292


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@359159 91177308-0d34-0410-b5e6-96231b3b80d8