[NVPTX] Misc table-gen cleanup (NFC)#142877

AlexMaclean merged 2 commits intollvm:mainllvm/llvm-project:mainfrom

AlexMaclean:dev/amaclean/upstream/misc-isel-cleanupAlexMaclean/llvm-project:dev/amaclean/upstream/misc-isel-cleanupCopy head branch name to clipboard