[PATCH] D23037: [CUDA] Fix libdevice selection.

[Artem Belevich via cfe-commits]

tra created this revision.
tra added a reviewer: jlebar.
tra added a subscriber: cfe-commits.

This makes clang's libdevice selection match that of NVCC as described in
http://docs.nvidia.com/cuda/libdevice-users-guide/basic-usage.html#version-selection

If required libdevice variant is not found, driver now fails with an error.

https://reviews.llvm.org/D23037

Files:
  include/clang/Basic/DiagnosticDriverKinds.td
  lib/Driver/ToolChains.cpp
  test/Driver/cuda-detect.cu

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