[C++11] MSVC 2012 can't handle list-initialization that calls
a constructor either. Just call the constructor directly. I'll look into
making this work with aggregate initialization some other time (when
I have someone with MSVC 2012 handy to test ideas).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202688 91177308-0d34-0410-b5e6-96231b3b80d8