Reland "[llvm-objcopy] Add support for relocations"

This change adds support for SHT_REL and SHT_RELA sections in
llvm-objcopy.

Patch by Jake Ehrlich

Differential Revision: https://reviews.llvm.org/D36554

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@312680 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed