[llvm] [llvm-size] Add -z option for Mach-O to exclude __PAGEZERO size. (PR #159574)

[James Henderson via llvm-commits]

jh7370 wrote:

I'd go with `--exclude-pagezero`, personally. Or you could go with a more general-purpose option of `--exclude-segment=<segment-name>`, but that's probably overkill.

https://github.com/llvm/llvm-project/pull/159574