[llvm-objcopy] Add -strip-non-alloc option to remove all non-allocated sections

This change adds a new flag not present in GNU objcopy that we call
--strip-non-alloc.

Differential Revision: https://reviews.llvm.org/D39926

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@318168 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed