[llvm-objcopy] Factor out CopyConfig
In this diff we move out CopyConfig from llvm-oobjcopy.cpp into a separate header CopyConfig.h
to enable us (in the future) reuse this class in the other implementations of objcopy (for coff, mach-o).
Additionally this enables us to unload the complexity from llvm-objcopy.cpp a little bit.
Test plan: make check-all
Differential revision: https://reviews.llvm.org/D53006
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@344307
91177308-0d34-0410-b5e6-
96231b3b80d8
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