message: Re-enable __builtin_expect when building with NVCC
  NVCC supports this construct as of CUDA 9.0
diff: @@ -79,11 +79,7 @@ limitations under the License.
  // analysis. Giving it this information can help it optimize for the
  // common case in the absence of better information (ie.
  // -fprofile-arcs).
  -//
  -// We need to disable this for GPU builds, though, since nvcc8 and older
  -// don't recognize `__builtin_expect` as a builtin, and fail compilation.
  -#if (!defined(__NVCC__)) && \
  - (TF_HAS_BUILTIN(__builtin_expect) || (defined(__GNUC__) && __GNUC__ >= 3))
  +#if TF_HAS_BUILTIN(__builtin_expect) || (defined(__GNUC__) && __GNUC__ >= 3)
  #define TF_PREDICT_FALSE(x) (__builtin_expect(x, 0))
  #define TF_PREDICT_TRUE(x) (__builtin_expect(!!(x), 1))
  #else
  