git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@303878 91177308-0d34-0410-b5e6-96231b3b80d8
Fixes PR27566. Differential revision: https://reviews.llvm.org/D30837 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@303874 91177308-0d34-0410-b5e6-96231b3b80d8