Revert "[AMDGPU] Elide bitcast fold i64 imm to build_vector"#160325

JanekvO merged 2 commits intomainllvm/llvm-project:mainfrom

revert-154115-v_mov_64_bitcast_combinellvm/llvm-project:revert-154115-v_mov_64_bitcast_combineCopy head branch name to clipboard