[NVPTX] Fixup under-aligned dynamic alloca lowering#139628

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

AlexMaclean:dev/amaclean/upstream/dyn_alloca_fixupAlexMaclean/llvm-project:dev/amaclean/upstream/dyn_alloca_fixupCopy head branch name to clipboard