[llvm] [llvm-size] Fix --totals option for Mach-O files (PR #157904)

[James Henderson via llvm-commits]

https://github.com/jh7370 commented:

LLVM uses a squash and merge approach to landing PRs, which means all commits in the PR get combined into one commit that gets rebased onto `main`, with a title and description that matches the PR title and description. This has a couple of consequences:

1) Please keep the PR to one feature/fix. Make additional PRs for subsequent features. If needing to stack a series of changes, see "stacked pull requests" in the GitHub docs.
2) Please don't force push to branches that are under active review, as it complicates the review process and is actually against LLVM policy. Instead, use fixup commits added to the branch, to make any necessary changes. If you need to rebase, use a merge commit, since the squash and merge will make the merge commit disappear.

https://github.com/llvm/llvm-project/pull/157904