[llvm] Update MachOObjectFile::exports interface

This diff removes the second argument of the method MachOObjectFile::exports.
In all in-tree uses this argument is equal to "this" and 
without this argument the interface seems to be cleaner.

Test plan: make check-all


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309462 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed