Summary: Tidied up errors during command line parsing to be more consistent with the rest of llvm-objcopy errors.
Reviewers: jhenderson, rupprecht, espindola, alexshap
Reviewed By: jhenderson, rupprecht
Subscribers: emaste, arichardson, MaskRay, llvm-commits, jakehehrlich
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D62973
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@363350 91177308-0d34-0410-b5e6-96231b3b80d8