[NVPTX] Renamed NVPTXLowerKernelArgs -> NVPTXLowerArgs. NFC.

After r276153 the pass applies to both kernels and regular functions.

Differential Revision: https://reviews.llvm.org/D22583

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276189 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed