Add the offload directory which contains the code needed to support
OpenMP 4.0 "target" directives. This will need more work for
generality, but we want to get it out and visible to the community.


git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@205909 91177308-0d34-0410-b5e6-96231b3b80d8