Make --inductor imply --backend inductor (#92764)
This is to make some downstream code more uniform (can always ask args.backend for backend)
Signed-off-by: Edward Z. Yang <ezyang@meta.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/92764
Approved by: https://github.com/voznesenskym, https://github.com/desertfire
