[OPENMP][NVPTX]Enable fast shuffles on 64bit values only if CUDA >= 9.

Summary:
Shuffle on 64bit data is allowed only for CUDA >= 9.0. Also, fixed the
constant for the mask, need one extra L in the end.

Reviewers: gtbercea, kkwli0

Subscribers: guansong, caomhin, openmp-commits

Differential Revision: https://reviews.llvm.org/D55440

llvm-svn: 348758