[OPENMP][NVPTX]Improve number of threads counter, NFC.
Patch improves performance of the full runtime mode by moving
number-of-threads counter to the shared memory. It also allows to save
Reviewers: grokos, gtbercea, kkwli0
Subscribers: guansong, jfb, jdoerfert, openmp-commits, caomhin
Differential Revision: https://reviews.llvm.org/D61785
git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@360457 91177308-0d34-0410-b5e6-96231b3b80d8
11 files changed