[NVPTX] Prevent fptrunc of v2f32 from being folded into store#149571

AlexMaclean merged 3 commits intollvm:mainllvm/llvm-project:mainfrom

AlexMaclean:dev/amaclean/upstream/trunc-store-2xf32AlexMaclean/llvm-project:dev/amaclean/upstream/trunc-store-2xf32Copy head branch name to clipboard