[CUDA] Added rudimentary support for CUDA-9 and sm_70.

[CUDA] Added rudimentary support for CUDA-9 and sm_70.

For now CUDA-9 is not included in the list of CUDA versions clang
searches for, so the path to CUDA-9 must be explicitly passed
via --cuda-path=.

On LLVM side NVPTX added sm_70 GPU type which bumps required
PTX version to 6.0, but otherwise is equivalent to sm_62 at the moment.

Differential Revision: https://reviews.llvm.org/D37576

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@312734 91177308-0d34-0410-b5e6-96231b3b80d8