clang 6.0 with CUDA support restrictions - Redmine #2443

clang 6.0 now works with CUDA 9.0, but the CMake code-gen does not respect the sm_20 deprecation.

(from redmine: issue id 2443, created on 2018-03-12 by pszilard, closed on 2018-03-16)

• Changesets:
  • Revision 2e3f4854 by Szilárd Páll on 2018-03-13T09:59:36Z:

Fix clang 6.0 with CUDA 9.0

This enables clang 6.0 CUDA build for sm_70 and works around an issue
which seems to affect sm_37 support.

Fixes #2443

Change-Id: Ib9c52e4a3a8ac1e05e851c8166eec4a6b5df4825