[OPENMP][NVPTX]General formatting/code improvement, NFC.

Summary: Formatting.

Reviewers: gtbercea, grokos, kkwli0

Subscribers: guansong, openmp-commits, caomhin

Differential Revision: https://reviews.llvm.org/D56290

git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@350431 91177308-0d34-0410-b5e6-96231b3b80d8
10 files changed