Hook up to the new clang __is_trivially_constructible and __is_trivially_assignable traits.  Fixes r10925427 and http://llvm.org/bugs/show_bug.cgi?id=12038.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@151406 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed