Reland "[llvm-objcopy] Add support for .dynamic, .dynsym, and .dynstr"

I did not upload two binaries that I reference in tests.

This change adds support for sections involved in dynamic loading such
as SHT_DYNAMIC, SHT_DYNSYM, and allocated string tables.

The two added binaries used for tests can be downloaded here and here

Differential Revision: https://reviews.llvm.org/D36560

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313772 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed