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

[Ryan Mansfield via llvm-commits]

rjmansfield wrote:

Test failures seem to be unrelated lldb tests:

`********************
Failed Tests (2):
  lldb-api :: commands/expression/import-std-module/vector-dbg-info-content/TestDbgInfoContentVectorFromStdModule.py
  lldb-api :: commands/expression/import-std-module/vector-of-vectors/TestVectorOfVectorsFromStdModule.py
`

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