[NVPTX] Eliminate `prmt`s that result from `BUILD_VECTOR` of `LoadV2`#149581

justinfargnoli wants to merge 2 commits intollvm:mainllvm/llvm-project:mainfrom

justinfargnoli:dev/jf/upstream-bv-combinejustinfargnoli/llvm-project:dev/jf/upstream-bv-combineCopy head branch name to clipboard