[NVPTX] Remove unnecessary isImageReadoOnly(), isImageWriteOnly(), & isImageReadWrite calls

This is repetition of isImage() function in NVPTXUtilities.cpp.

Patch by Briana Grace!

Differential Revision: https://reviews.llvm.org/D30706

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@297252 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed